That did occur to me, being an 11" display at 1366x768; however, I believe it worked at some point, and there is the matter of the very long pause, plus it happens when I've closed all other views and in full-screen mode. Makes me wonder if something else isn't going on here?
If your data has many nodes on the same level, it may also happen with 10.000 or more horizontals pixels [1]. In order to see how much memory is spent, you can click on the memory widget in the right lower corner of the BaseX GUI.
[1] https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/gui/vie...