Deleting environmnent from switch environment combo box

Hello everyone

I have a question about enviroment  switch.

We have a development environment, and we shut it down and swaped it for a new one, but it still shows on the enviroment combo box has shown in the image.

How can we delete  old environments we don't use anymore? 

This looks to pull from the file Settings.xml in the folder C:\Users\<yourusername>\AppData\Local\OutSystems\ServiceStudio 10.0

Edit at your own risk!