How do I change my keyboard layout correctly? Only discord is affected.

I've been trying to change my keyboard layout since yesterday and I still haven't figured it out. A minor problem is that I don't know how to quick switch keyboard layouts like in windows with win + space but the main problem is, changing my layout only works in discord. Using the typing field in settings and firefox and other programs, seems to only use "the default" keyboard, possibly english us, for example, alt + i = . Trying to use the German layout specifically, doesn't work at all, and neither does English Irish and possibly Japanese.

This is my first time using Linux, so my bad if it's something simple.
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