This has been mentioned in Ask for Help, so here’s the feature request.
If a linked table is not currently linked to anything, it would be nice to have a way to delete it directly without first linking it to an app.
Going a step further, a dedicated area to manage all Glide Tables would be great. In addition to which apps use the linked tables, the name in each would be useful, in cases where they have been re-named from the original.