review logic of closing (last) tabs in sidebar

it seems currently 1st tab in sidebar is automatically protected from closing.

I can see the thinking/reasoning, but also think this gets a little counterintuitive/laborious once there is more than one tab open.

Practically it often occurs that I open up other tabs in the process – and need for first tab vanishes.

In current configuration I first have to reposition the first tab to then be able to close it. This is fricticious and also a little counterintuitive/'hacky'.

I can see reasons to discourage no tab being opened (– even though Capacities has quite an elegant fallback with a 'blank' sidebar offering and presenting different follow-up actions). But I would think something like a warning ("you are closing the last/only tab of the sidebar. Really?") or some other solution would make UX more coherent.

Currently it seems like an unneccessary quirk.