Add option to remove saved configurations.

[Pawloland]

Hi again. Evey time windowtop starts it shows me these popups:

I don't remember how I opened those windows so I can't delete the configuration from the arrow on title-bar. It would be good to have an option to remove the saved configuration somewhere in the settings and directly from these popups, because it would be easier to identify the ones that are annoying.

[gileli121]

Thanks for the suggestion.
Another user asked for it