To Reproduce
save as mrpack without config folder
save fancymenu config as zip
download minecraft by minecraft_launcher_lib (python)
add fancymenu config in minecraft folder

Expected behavior

Basic Informations (please complete the following information):
OS: Windows 11
fancymenu_fabric_3.2.3_MC_1.20.1
Fabric Version 0.15.11
Minecraft Version 1.20.1

This is not a bug, you just didn't use the correct anchor points: https://docs.fancymenu.net/en/positioning-elements
Please join the Discord for support, thank you very much!
#569