[Question] How to switch between windows and how to close a window?

[StartEndUser]

For some reasons, some applications have multiply windows in the same time.

I need to switch between these windows but I don't know how.

Closing windows could work but I don't want to close them and some applications don't have any button or keyboard shortcut to close it.

I tried using the -s option to switch to the terminal and use kill to close a window but that would just close the whole application not one window.

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So, how to switch between windows and how to close a window? Is it possible?
Thanks.

[joggee-fr]

I don't think it is possible right now to do. No shortcut is defined to switch between windows.
However, once wlr-foreign-toplevel-management protocol support will be added to Cage, some solutions should be possible. See issue #99.