What is the shortcut to switch the view in Toggle Quad view mode (Ctrl + Alt + Q)?

On rare occasions, I may want to work in this mode.
I can switch between views with Space in Maya and Alt + W in 3ds max.
When I switch the Toggle Quad view mode (Ctrl + Alt + Q) again, it returns to Perspective, but I cannot switch the view.
Help me.

By default Quad View is locked, you have to open Sidebar (N key), display View tab and open Quad View panel.
There, you just have to disable Lock option to be able to switch view.

Be aware that you will lost Perspective view by proceeding that way.
If you go to Front View, for example, and recall Quad View, your Perspective View will be a Front View.