Maybe it's a silly question but I can't find an answer:
How do you apply the same keybinds to all your alts at once?
Do I have to copy some file in game folder somewhere? is there an in-game option for this?
There is no in-game option, but there are addons which can do it.
I use Binder which hasn't been updated in years but still works and is very simple to use and completely invisible (it works through chat commands).
There's also Votan's Keybinder which I think has a few more options. There might well be other addons which do it as well.
You might also find Synced Account Settings useful, which copies other settings between characters. With this and Binder starting a new character has become much easier, I can pretty much just start playing instead of spending 10 minutes or so standing in a prison cell getting everything set up.
PC EU player | She/her/hers | PAWS (Positively Against Wrip-off Stuff) - Say No to Crown Crates!
"Remember in this game we call life that no one said it's fair"