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Do you mean just in selected sub-folders and their children?
Because if not, and you mean for all sub-folders, you can turn off the Sidebar completely in Settings - Preferences - (scroll to bottom) - Advanced Preferences.
Then when you need the Sidebar visible for navigation to another folder you can briefly access it via the "menu" icon at the top left of the window.
Otherwise, you'll need to open a Support ticket with FM themselves, as they won't see your suggestion here.
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