The left and right panels should have buttons to hide and show them.
e.g. Off canvas menu as in How To Create an Off-Canvas Menu
Norbert
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Yes, this has been discussed, see:
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Hello,
We are interested, as the feature is available in Confluence from which we want to migrate. How could I test it?
You’ll need to wait for it to be implemented first! Or send a Pull Request to speed up the development 
Or sponsor the feature to speed it up, see https://dev.xwiki.org/xwiki/bin/view/Community/Contributing#HSponsoraFeatureorBug
However, since there’s already a draft PR for it, it means the work has been started so hopefully you won’t have to wait for too long. You can follow on the status of the PR at XWIKI-12824: Add buttons to hide/show panels by Sereza7 · Pull Request #2831 · xwiki/xwiki-platform · GitHub
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