I ran into an issue this morning within the OneNote Windows 10 app. I went through exploring multiple shades of page colors. And as I tested them all out, I did a CTRL + Z to undo as far back to my original page color. But it stopped undo'ing after a certain point. I was easily able to restore my default color by clicking on "No Fill" under Page Color, off the View tab in the ribbon. But the point is...how many undo's do we have? and how can we increase that amount if we wanted to?