Properties window can't be re-integrated into Main window

Hi, new user here, thanks for creating the MIDIhub! In the editor application (macOS 26.5.2) I turned the Properties window into a separate window, but now I am unable to make it part of the Main editor window again. Please, how do I do this? Opening Properties again via the view menu or keycommand opens it again as a separate window. Thanks much in advance!

Hey, you should drag it by the title bar into one of the main window’s edges so it docks in that area.