📝 Provide a description of the improvement

Right now, both sidebars have a fixed width regardless their content. That ensures the layout is always the same, e.g. editable is in the screen center. However in some cases it is troublesome, e.g. for narrower displays the right sidebar could be hidden if it doesn't contain any UI elements.

This could be partially solved by setting the width on particular sidebar items rather than the containers, but it fails when you only have one empty sidebar (the editable is no longer in the middle then), so it requires a bit more sophisticated logic.

📃 Other details

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