How To Add Vertical Divider similar to notion?

How To Add Vertical Divider. Most of the time there is too much space available on the right side. Would be great if we can utilize it.

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Pretty easy using Custom CSS and a tag. RemNote’s markup needs a minor addition before though. See Custom Rem-level formatting with tags for a demo of your use case (Column Layout).

A workaround in the meantime is to open the side panel to the same rem (lower left corner).