OneNote Show Pen Float Toolbar in Horizontal Full Screen, But not Show the Toolbar in Vertical Mode of Surface

Question

OneNote does not have a pen toolbar in the vertical screen of the Surface, but it does have a pen toolbar in the horizontal screen.
 

This is horizontal mode

This is vertical mode

Answer

 
It is indeed a scaling issue.
This looked like it was zoomed.
Right-click on the desktop, open windows “Display Settings”, and set “Change the size of text, apps, and other items” to 100% under “Scale and Layout” for the primary Surface display.
Check and see if you can view it now
 

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