Rainbow Six Dreamcast question

Hello. New to this so I apologize if this is ignorant but... I've installed Rainbow Six on my Steamdeck using Emudeck (Flycast) and can get the game to mostly work, but the mouse on the planning phase doesn't appear so I can't plan... which is a huge part of the game. I've tried to use RetroArch (Flycast) with the same results, and attempted to use Redream, but I can't get Redream to recognize the ROM from this site so I can't test the game.

Thanks for any and all help!