This Gnome Extension prevents the mouse cursor interfering with either the App Switcher or the Window Switcher popups. Note: It doesn't prevent mouse clicks.
These are the switcher popups that are invoked from keyboard shortcuts, e.g. Alt+Tab or Super+Tab.
Based on https://extensions.gnome.org/extension/4714/disable-hover-on-app-window-switcher-popups/ (for Gnome <45)
The extension can be installed using this link on Gnomes Extensions Site.
Have fun,
someone.earth