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The point here is that there are two separate features: tab groups and private mode. And they are all combined in one menu.

By dividing these two buttons we can decrease: the amount of taps it takes; the time it takes to find the button you need; and overall make it simpler.

Here's just one of the many solutions:

tabgroup-jpg.2035116


In this case if you need a private mode, you just tap it (one click) relying on your muscle memory. Same goes for tab groups.
 
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