I have a 40" 4K monitor, which is 110 Pixels Per Inch. When I view, say, a letter-size page in Draw at 100%, it’s smaller than the size of the real page. I want 100% on the display to actually be 100% of the real page.
Alternatively phrased, if I draw a 10" line in Draw, it should physically measure 10" on the display using an actual ruler.
It looks like LO is rendering at 96 PPI. Can I change it to 110 PPI? Where?
Somwhere in your unknown OS. Resolution and scaling is typically set in the OS and should be detected by programs.
If you can’t find where to set DPI, adjust the zoom factor. If rendering is based on 96dpi, then for 110dpi set zoom at 115%. Alternatively, use screen rulers. These are small utilities you can move on your screen as a vertical or horizontal ruler (switchable with a right-click + menu). Unfortunately, they usually measure pixels.