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Explained: Why you can't move Windows 11 taskbar like Windows 10, according to Microsoft
(www.windowslatest.com)
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The taskbar items can't have a constant width. Your whole taskbar layout changes when you change a tab in Firefox. You have to open a set of programs from right to left, because any other order will change the positions of the items you want to click.
When not combining windows, in Windows 10 you could order them to your preference and usefulness. Now, you're stuck. Even when not combined, the items are combined in one block, and you can't order them within the block either.