the button to turn off mods not working

Solution

(Known issue

TargetRename1.0

TargetRename1.0

smmsteam1.0

smmsteam1.0

Temp1.0PluginFailedToLoad

Temp1.0PluginFailedToLoad

) 1.0 has renamed the game target, preventing SMM from being able to automatically uninstall mods.

To remove mods, delete the mod folder manually as described here: https://docs.ficsit.app/satisfactory-modding/latest/faq.html#Files_Mods.
After you have deleted the mods folder, launch the game normally from outside of the Mod Manager application.
If you are still having issues, also delete the Plugins folder then verify your game files to restore it: https://docs.ficsit.app/satisfactory-modding/latest/faq.html#_how_do_i_verify_my_game_files