2 players use 2 UIs at the same time

Hello everyone, the game I’m working on have a local multiplayers mode (2P) in the game. In the game, when you finish each round, the Shop UI opens. P1 and P2 can navigate their own shop window independently by separate keyboard inputs. (Basically, it’s like a select character UI in a fighting game that 2 players select their own character, but each player has their own window)

I tried to use Event System to manage it, but it can only select 1 button at a time. If anyone could suggest me how to do it properly, that’d be great. Thank you very much.