Unlike the rest of the platform for some reason, there is no apparent way to simply modify a meta key where it lists them for a given page. I created a meta key as a means of testing, but I can't find any option on any component of wordpress that lets me simply append or delete the entire name and its subsequent handles. There is a rollever icon when I roll over the meta key, but no matter how many times I click on it, nothing new loads or attempts to load.
Metas do not exist on wordpres without handles. Therefore, if you remove all handles from a meta of a given name in your Meta Data Handling section (not accessible from menu without a plugin, rather by adding a new meta key), the key will be automatically deleted.