Recalling Spectralayers to screen

Every time I lift an unmerged vocal track to the Nuendo project window, the Spectralayer interface loses focus and disappears. Have I got to go to the Windows menu and select the Spectralayers menuitem to get it back. Is there a Key command possibility here??

Hi @andyoc , is that on Windows or macOS ? Would you be able to do a video capture of the issue ?