keyboard shortcut for changing windows of the same app
Dear all
I've this silly question, but it's driving me crazy. I know that if I want to change app, I have to do cmd+tab. But I cannot find the keyboard shortcut for changing windows of the same app. Let's say: I have two Numbers files open in two windows and I have to do some copy&paste between them, I cannot do cmd+tab because they are of the same app, I can make it through app exposé (using the trackpad or pressing cntr+F3) but it not comfortable at all. I did some searches on the web but I did not find anything.
Is there somebody who can help me please?
Thanks
Carlo
Mac mini, macOS 10.13