Have you tried running it with --no-sandbox flag? In a terminal:
.itch/itch --no-sandbox
It works for me but is there a way I can edit the app so I dont have to use the terminal every time
Just create a script and place it on your desktop, panel or menu where you can simply click on it.
you can edit the application launcher in ~/.local/share/applications directory. edit the io.itch.itch.desktop file to add –no-sandbox at the end of the Exec= line