Testing version: 10731
When using the sketcher, the pen size becomes relative to the number of panes open, even when you don’t change it. That is: you write with a given size with 3 panes open, when you view that note full screen, the pen size is bigger than the same writing, same setting, as with two panes open or note viewed full screen. It’s inversely proportional to the available canvas on which writing has occurred at that moment, and it should not, the stroke size should remain the same:
Do not pay attention to the 3-pane lettering size, it’s for legibility, only look at the stroke thickness between the three lines of text. It is inversely proportional to the number of panes open when that writing was done. No pen settings were changed.