It is now possible to re-order the position of repositories in the list. The repo at the top has the highest priority while the repo at the bottom has the lowest priority. Only if an app is available from more than one repo, the priority matters.
For example, if NewPipe's repo was added and the user always wants to prefer apps from that repo, they can move it to the top. In older versions of F-Droid, newly added repos were implicitly granted higher priority than repos added before.
@grote Wow! That's huge!