Have you tried to increase the Minimum Tab width (px)? Then the panel becomes "ealier" scrollable. Generally, it first tries to reduce the tabs to the minimum size to suppress the scrollbar as long as possible. Only when all have reached the minimum size, they will go beyond the panel.
I've planned an additional option to select the unpin behavior. See here and on GitHub. But this is blocked by an issue (I guess it is) in the App.