This is my name for covering something with a colored box and then moving the box to reveal what’s underneath.
This is pretty easy to do. First, type whatever you want to hide. Arrange it by size and color, and then lock it in place using the grey “work box.”
Next, go to your toolbar and select the shape tool. Choose a shape (in this case, I used a rectangle.)
Drag the rectangle to the size you want, and select it so the grey box appears. Under “properties,” select FILL COLOR and choose the color you want to use.
I typically clone the box so I don’t have to make it over and over again.
You may need to arrange the box so it will sit on top of what you want hidden. To do this, use the “Order” option under the grey “work box.”