Sep 17, 2019 - 03:08 PM
When you first open the Virginia Activity, you can paint inside of the land area as expected.
However, if the students have accidently selected "Send to Background" then the fill tool will fill the entire page since the black lines are now part of the background and not the paint layer.
I suspect this is what has happened here. If you right-click a page, long press (on a tablet), or press the trackpad with two fingers on a Chromebook, you will see the page options context menu.
I would try using the Undo button until it is disabled (the land is all white again) and then trying the Fill tool again.