I created a new addon (worthy of $25) that hides/shows masterpages in the sidebar for any user, including superadmin! The sidebar can be less cluttered, allowing to focus on the workspace without scrolling.

Hide/show items in sidebar tweak
Screenshot-2022-11-24-142150.251.png (61.34 KiB) Viewed 109 times

I will use it during development myself, because 100% time I am logged in as superadmin and keep seeing unnecessary & hidden templates in sidebar. Of course similar functionality is already available here (free for all) Tweakus sidebar tweaks → hide items

My addon only makes management more comfortable compared to manual editing of the hide-items.php file.