I am using 1.16.1 fabric, list of my all other mods I am using is below,
Your mod load normally and show me chat history as well but when I click on setting button no matter its single-player or multiplayer my game crash and generate this report.

My Crush Report

m3---- Minecraft Crash Report ----
// Shall we play a game?

Time: 10/22/20 2:01 PM
Description: mouseClicked event handler

java.lang.NoClassDefFoundError: io/github/prospector/modmenu/api/ModMenuApi
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:163)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.darkkronicle.advancedchat.gui.AdvancedChatScreen.lambda$init$2(AdvancedChatScreen.java:79)
at net.darkkronicle.advancedchat.gui.elements.CleanButton.method_25402(CleanButton.java:57)
at net.minecraft.class_4069.method_25402(class_4069.java:27)
at net.darkkronicle.advancedchat.gui.AdvancedChatScreen.method_25402(AdvancedChatScreen.java:218)
at net.minecraft.class_312.method_1611(class_312.java:92)
at net.minecraft.class_437.method_25412(class_437.java:431)
at net.minecraft.class_312.method_1601(class_312.java:92)
at net.minecraft.class_312.method_22686(class_312.java:162)
at net.minecraft.class_1255.execute(class_1255.java:94)
at net.minecraft.class_312.method_22684(class_312.java:162)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101)
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:109)
at net.minecraft.class_1041.method_15998(class_1041.java:308)
at net.minecraft.class_310.method_1523(class_310.java:1041)
at net.minecraft.class_310.method_1514(class_310.java:654)
at net.minecraft.client.main.Main.main(Main.java:215)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:224)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: java.lang.ClassNotFoundException: io.github.prospector.modmenu.api.ModMenuApi
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:168)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 38 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:163)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.darkkronicle.advancedchat.gui.AdvancedChatScreen.lambda$init$2(AdvancedChatScreen.java:79)
at net.darkkronicle.advancedchat.gui.elements.CleanButton.method_25402(CleanButton.java:57)
at net.minecraft.class_4069.method_25402(class_4069.java:27)
at net.darkkronicle.advancedchat.gui.AdvancedChatScreen.method_25402(AdvancedChatScreen.java:218)
at net.minecraft.class_312.method_1611(class_312.java:92)

-- Affected screen --
Details:
Screen name: net.darkkronicle.advancedchat.gui.AdvancedChatScreen
Stacktrace:
at net.minecraft.class_437.method_25412(class_437.java:431)
at net.minecraft.class_312.method_1601(class_312.java:92)
at net.minecraft.class_312.method_22686(class_312.java:162)
at net.minecraft.class_1255.execute(class_1255.java:94)
at net.minecraft.class_312.method_22684(class_312.java:162)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101)
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:109)

-- Affected level --
Details:
All players: 1 total; [class_746['MiskatBD'/254, l='ClientLevel', x=114.91, y=83.39, z=-4.25]]
Chunk stats: SodiumChunkCache: 573
Level dimension: minecraft:overworld
Level spawn location: World: (-48,69,-160), Chunk: (at 0,4,0 in -3,-10; contains blocks -48,0,-160 to -33,255,-145), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 57583 game time, 4003 day time
Server brand: fabric
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.class_638.method_8538(class_638.java:449)
at net.minecraft.class_310.method_1587(class_310.java:2181)
at net.minecraft.class_310.method_1514(class_310.java:672)
at net.minecraft.client.main.Main.main(Main.java:215)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:224)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)

-- System Details --
Details:
Minecraft Version: 1.16.1
Minecraft Version ID: 1.16.1
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_251, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 3902984664 bytes (3722 MB) / 5369233408 bytes (5120 MB) up to 5592580096 bytes (5333 MB)
CPUs: 4
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms2000m -Xmx6000m
Fabric Mods:
advancedchat: AdvancedChat 2.0.5
antighost: AntiGhost 1.16-fabric0.13.1-1.1.2
cloth-basic-math: Cloth Basic Math 0.5.1
cloth-config2: Cloth Config v4 4.6.0
cotton-client-commands: Cotton Client Commands 1.0.0+1.15.2
easiercrafting: EasierCrafting 1.16-fabric0.13.1-1.6.4
fabric: Fabric API 0.18.0+build.387-1.16.1
fabric-api-base: Fabric API Base 0.1.3+12a8474c02
fabric-biomes-v1: Fabric Biomes (v1) 0.2.7+059ea86602
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.4+c6a8ea8902
fabric-command-api-v1: Fabric Command API (v1) 1.0.8+5ce5339802
fabric-commands-v0: Fabric Commands (v0) 0.2.0+52d3083602
fabric-containers-v0: Fabric Containers (v0) 0.1.8+045df74f02
fabric-content-registries-v0: Fabric Content Registries (v0) 0.1.9+059ea86602
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.2+b7f9825d02
fabric-dimensions-v1: fabric-dimensions-v1 1.0.0+a71b305302
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.0+e540c58402
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.0+16acbe5b02
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.0+fe81e12502
fabric-item-api-v1: Fabric Item API (v1) 1.0.0+16acbe5b02
fabric-item-groups-v0: Fabric Item Groups (v0) 0.2.0+438f963602
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.1+f404f3be02
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.0+3fa9f7c502
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.2.0+e83e061c02
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.0.0+386eb69e02
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.2+b764ce9902
fabric-models-v0: Fabric Models (v0) 0.1.0+dfdb52d602
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.5+b50ffc7b02
fabric-networking-v0: Fabric Networking (v0) 0.1.10+e00ecb5f02
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.5.7+2242e77202
fabric-object-builders-v0: Fabric Object Builders (v0) 0.6.1+a2d21ddd02
fabric-particles-v1: fabric-particles-v1 0.2.1+0a6f2a7002
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.3.8+7dba2d6c02
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.2.13+eae12eb802
fabric-renderer-indigo: Fabric Renderer - Indigo 0.3.4+34d6c87102
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.1.0+be551d3c02
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.3+b7f9825d02
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.8+b7084faa02
fabric-rendering-v0: Fabric Rendering (v0) 1.1.0+5341049002
fabric-rendering-v1: Fabric Rendering (v1) 1.1.2+346247d702
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.2.6+f41e209802
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.1.0+97324d1102
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 0.2.7+a4c57d8e02
fabric-textures-v0: Fabric Textures (v0) 1.0.4+eae12eb802
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.2.1+91fca5cd02
fabricloader: Fabric Loader 0.10.3+build.211
gbfabrictools: GBfabrictools 1.2.2+1.16
inventoryprofiles: Inventory Profiles 0.4.2
litematica: Litematica 0.0.0-dev.20200711.162756
malilib: MaLiLib 0.10.0-dev.21+arne.1
minecraft: Minecraft 1.16.1
sodium: Sodium 0.1.0
waila: Hwyla 1.9.22
xaerominimapfair: Xaero's Minimap Fair-Play 20.20.1
xaeroworldmap: Xaero's World Map 1.10.1
Launched Version: MultiMC5
Backend library: LWJGL version 3.2.2 build 10
Backend API: Intel(R) HD Graphics 530 GL version 4.6.0 - Build 27.20.100.7990, Intel
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
CPU: 4x Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz

Sorry I didn't respond. Haven't been super motivated for mods. Hopefully it was fixed.

Still waiting bro

You don't have Mod Menu installed, which is required to use the settings.
Link: https://www.curseforge.com/minecraft/mc-mods/modmenu