Cannot install F-Droid apps through App Lounge

That’s the trouble with small screens, they’re narrow minded and don’t allow the broad world view which might have allowed me to notice someone had asked a v similar - in fact, direct opposite - Q before I posted my own

Oops; Soz

Anyway, if it’s useful info, I installed the Amazon App Store when I needed an ‘official’ version of Tailscale and couldn’t work out how to disable the F-Droid ‘inofficial’ (Tailscale do link to F-Droid, but don’t build for it) version in App Lounge