Clipping tile layer

[ThomasGoodridge]

I have this historical imagery map with multiple layers, and the looks messy. Is there a way to clip the excess from these layers to make it look better.

[RussRoberts · Accepted solution]

You can bring them all into a group, place a sketch layer in the group and draw a white polygon. On the sketch layer set the blend mode to Destination Atop

Before

After

[ThomasGoodridge]

That works perfectly, thank you!