Blocks the 'Include in library' folder shell handler. Libraries still work and you can manage them from the Libraries view; this only removes the context-menu submenu most people never use. Reversible.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://learn.microsoft.com/en-us/windows/win32/shell/reg-shell-exts