Thank you for the tip on bug filing, I just saw the commit for the fix, looks good.
This leads me to wonder, would there be any adverse effects of allowing a 0x0mm custom page size?
For usage context, I usually hide the “Drawing Sheet” as is allowed in the GUI here…

This is because I prefer to do layout with the origin in the center of the board and the Drawing Sheet is distracting.
From prior forum reading, origins and the layout-sheet-concept overall seem to be recurring topics of debate, so it’s not my intention to bring those up, and I’ve tried using the “Grid Origin” offset in the “Grid Settings”, but since it doesn’t change the coordinates in the GUI, it unfortunately does not help with centered-layout.
Might a possible way to disable the sheet entirely be to allow a custom sheet size of 0x0mm?