When the last open XD file is closed, the preview window remains open. This causes problems in opening a new document on my Mac.

Once I've closed all remaining XD files, when I go to open a new one from the welcome screen, I click the XD icon in the dock – but instead of opening the welcome screen, it takes me to the black-screened preview window (which, in full screen, sometimes will not reveal the red window close button in the top left). This means the only way to see the welcome screen is to completely quit XD and restart it.