STG Icon Now Displays Tabs, Not Other Groups

[NateTut]

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In Simple Tab Groups for Firefox (STG), the icon (apologies if icon is not the correct term for the STG group pic in the top bar), not displays tabs in the group, not the other groups to switch to. You have to select another menu item to get to the other groups. I'd like to toggle this off and go back to the earlier functionality where this icon would allow you to switch groups, since there are a lot of other ways to view the tabs in this group, but no other way to switch groups.

Thanks.