Cancel mid-installation button

[FMorschel]

Hello! I've just installed the store and love its speed! The one small thing that annoyed me is that I tried installing Discord and forgot to change from Flathub to System. My internet is a bit slow and I had to do the full installation to then uninstall it and reinstall again.

So either I couldn't find it and maybe the UI/UX could be improved or there is no cancel mid-installation button and in this case I'd like to ask for it.

Thanks for your time!