This is a real good question:
444 x 296 seems to be a spelling error, as a) it results in an error message in the script when checking and b) it doesn't fit in the object settings either. (Earlier it was always 444 x 266).
I noticed the following in AC 24 on MAC OS in the object settings: you can use a UI size of 480 x 282 pixels without any INFIELDS being cut off when the window is collapsed. (In the script, however, an error message is issued from 481 x 268).
I can also define much larger UIs and since AC 22 (?) the UI size in the settings dialog always adjusts automatically.
It can of course be collapsed smaller so that parts are cut off.
The official size of UIs in MVOs is still a bit different from the standard.
Here an official statement from Graphisoft would be helpful, because there seem to be contradictions between script and settings dialog.
Joachim Suehlo . AC12-26 . MAC OSX 10.15 . WIN10