If I click on "Add Folder", select a folder, then click on "Select Folder", Picard moves into that folder. In other words, if I click on "Add Folder" again, I need to move back to the parent folder to select another folder at the same level of the first one. Picard should stay in the parent folder.
For instance if I have several albums of the same author, and I want to add some of then, I need to select the first folder, then move back and select to the second one, then move back and select the third one, etc. (of course I know that I could also drag and drop the folders).