Control over "More" Dropdown in Sidebar

How can we adjust the “More” dropdown for folders in the left sidebar, so that we can show a list of folders permanently, rather than them showing under the “more” dropdown…

The purpose of the More folder is to hide folders you don’t ordinarily want to see. Therefore it is collapsed by default.

If there are folders in there that you want to see permanently, right-click on them and choose Show.