The game crashes due to Fabrication's special configuration screen not allowing the Panorama to be rendered.
Thread: Render thread
Stacktrace:
at net.minecraft.class_350.redirect$zjn000$renderPanorama(class_350.java:621)
at net.minecraft.class_350.method_25394(class_350.java:179)
at io.github.prospector.modmenu.gui.ModsScreen.method_25394(ModsScreen.java:253)
at com.unascribed.fabrication.client.FabricationConfigScreen.method_25394(FabricationConfigScreen.java:254)
Mods: BedrockIfy 0.2.0, Fabric API 0.26.0+1.16, & Mod Menu v1.14.10

With the last version of BedrockIfy (0.2.1) This issue has been fixed and you should be able to run BedrockIfy and Fabrication with "Panorama Backgrounds" enabled!!!

Thanks for reporting this issue! I'll try to push a fix for the next version. For now, you can disable "client.features.panoramaBackground" mixin in the Mixins tab in the BedrockIfy Settings menu (Make sure you are using bedrockIfy 0.2.0+) an restart the game.