No individual Viewports showing on Viewport tabs

No individual viewport names are showing on Viewport tabs, only layouts and one called “model” which shows either whichever one was previously active, or all four of them. I’d like to get the individual views back showing. Rhino 8

or type the command- ViewportTabs then show.

Thanks but that just turns on and off the entire row of tabs. It doesn’t correct this problem, which is that when the row of tabs is visible, all the viewports are agglomerated under one tab called “model”, and don’t have their own tab.

Right click on the tab and uncheck the following: