when i try to turn on free cam my game crashes
Mods I have :
Sodium
Indium
Iris
Minihud
Litematica
Tweakeroo

@DynamicMC can you provide info please since we know nothing now

Crash report is needed, also what other mods?

when i try to turn on free cam my game crashes Mods I have : Sodium Indium Iris Minihud Litematica Tweakeroo

Try removing the Indium mod completely, I don't use it and I have the same mods, freecam is useable without it as well.
As far as I know Indium is not necessary for any of your current client side mods listed.