Hide the navigation bar
The biggest problem I have with the current version is that the navigation bar can not be hided. For older ipads, especially for 9 inch display ones, every bit of screen space counts, and the nav bar really takes too much space. So it would be really nice to allow users hide the nav bar while keep pen tool bar on display, just like hiding the nav bar when the pen tool bar is not open.
Alex Hwang commented
It's 2022 and there are still users like myself who are voting for this idea!