Have you checked out Microsoft Edge’s Vertical Tabs feature? Normally, tabs display at the top of the browser like this.

But, if you’d prefer a cleaner look at the top of the page, you can switch your open tabs to the side. Just right-click and choose Turn on vertical tabs from the drop-down menu.

Or click the icon at the top far-left.

Your tabs will now appear on the side.

To switch back, just right click and choose Turn off vertical tabs.