You can run this command in the terminal:
ls /usr/share/applications
Or just go to Files and look within the usr directory (inside “File System”), then within the share directory, then within applications.
BTW, there’s a new, nearly automatic way to scale apps now. Install phosh-mobile-settings, open it, minimize it, then open the app that needs rescaling. Go back to phosh-mobile-settings (called “Mobile Settings” in the app grid, and it’s separate from the phone’s Settings app), then enable scaling for the open app.