I don't agree with the suggestion here, hide is indeed broken in BG3 but it should still be possible to use it in combat (as RAW). However, this is a difficult thing to successfully do in that context.
More info on Hide :
https://blackcitadelrpg.com/hide-action-5e/One big issue here, as mentioned in many other threads, is that Hide (RAW) shouldn't be an Bonus Action but an Action except for classes who have specific features allowing them to do so...mainly, Rogues.
There are other issues with sneaking/hiding in combat, see those threads talking about this :
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=837642https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=838995https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=838996