They are a complete waste of space.
Right click on one of the tabs, then select Hide Tabs (or similar). I tried right clicking on the bar next to the tabs before.
If you do not want them to open at all, set this in Options > Appearance page > Show the following items".
Thanks, @pascal. I have seen the option “Viewport tabs at start”, but didn’t know what it does, as clicking it had no immediate effect (obivously). Proposal: Rename to “Viewport tabs”, and when clicking it make the viewport tabs toggle right away, just like “Status bar”, “Viewport titles”, etc.
But perhaps there is a reason for the weirdness?
Tabs are object containers in the Microsoft framework, don’t believe it’s possible to safely toggle those on/off while preserving the viewports.
At least toggling tabs off works, as it can be done with the right mouse button. But toggling them back on may be impossible without a restart.
Not in front of my computer to double check, but viewportTabs should alow you to toggle them
Note that you need to right right click on a tab, not just anywhere on the bar with the tabs.