How do I disable Windows-F

Solution 1:

If you don't use 'Feedback Hub' on Windows 10, you can remove it. Then 'Win + F' shortcut will be also removed.

To remove 'Feedback Hub', open start menu, scroll down to find 'Feedback Hub' icon, click mouse right button on the mouse, and click 'Remove' on the popup.

Solution 2:

Maybe you want to try AutoHotkey?

From its Wikipedia page: AutoHotkey is a free, open-source custom scripting language for Microsoft Windows, initially aimed at providing easy keyboard shortcuts or hotkeys, fast macro-creation and software automation that allows users of most levels of computer skill to automate repetitive tasks in any Windows application. User interfaces can easily be extended or modified by AutoHotkey (for example, overriding the default Windows control key commands with their Emacs equivalents).

You should check out this SuperUser question as well: Rebind Win+F hotkey in Windows 7

Disclaimer: I haven't ever used AutoHotkey so I have no idea if it has what you want.