I am creating coloring pages for my students and I made one with over 1200 squares to color in. I now want to separate it into different pages, but I can’t seem to unlock all of the squares to separate them into separate pages. I tried the unlock/lock stuff, but it only unlocks one at time. I tried to highlight the entire area and unlock them, but it didn’t work. It seems like I have to unlock the individual squares one at a time. I really don’t want to click through 1200 squares. Is there a way to unlock all in design?

Or is there a way to highlight multiple objects or layers and unlock all of those?