This would mean to have the tab sidebar match the sidebar for tab groups on iPad os. This would mean adding the animation where it’s fast but slows down at end compared to the tab sidebar just moving to the right. This maybe similar to https://orionfeedback.org/d/7462-use-spring-animations-instead-of-linear-pseudo-spring
(I don’t know why it lags in the video when it was working fine for me)
Additionally I noticed that there are two places where it tells the user how many tabs open I would suggest removing the top left one and replace it with the edit button.

Something else that should be improved is the buttons “edit” and “close all” should be blue just like the top text on the left sidebar.
Oh and also possibly match the colors