TextGrid : Window

 New Editor: creates a second Score View which opens in a second tab behind the current editor field.

Navigation: allows to activate and switch between editors. Activated editors can be minimized and maximized. You can choose the previous perspective, editor or view.

 Preferences: Here you can also change some preferences for MEISE under "Meise Preferences", e.g. to force the Lab to use the MEISE perspective when opening a MEI document.