Off topic, but how do you do that on Lemmy? In jerboa there is no option (that I know off) to browse another instance. Do you open your home instance in one browser tab and the one you want to explore in another and once you find a community you like you switch to the other tab and subscribe to it there?

It could. It just doesn’t want to. Why would it? Its your computer.

If you want to delete / including the EFI partition turning your machine into a paperweight you should be allowed to do so.