The tab preview was one feature that I use(d) a lot, especially when using PC doing research and general comparison type work. As a mechanical designer, it is nice to have a number of open tabs on Edge for research, comparisons, and listening to various tech videos whilst doing work. But, what I truly miss was the ability to preview the open tabs in the TASK BAR similar to WIN7 taskbar preview. I liked how I could just hover over the icon for a second or two and it would then show all my open windows - up to a certain number of tabs (which I think was maybe determined by screen size?). I ESPECIALLY LIKED the ability to use the scroll button click (MMB) to close them through this tab preview. I was able to close certain windows no longer used without actually having to open the Explorer window - it saved a lot to time for me and was really handy!
I added my comments also here:
https://techcommunity.microsoft.com/t5/discussions/tab-preview-discussion/m-p/1648628/highlight/true#M34973