Place the icon on the new tab button in the center to not mess it with rest tabs left aligned text in vertical mode.
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There are 2 issues:

When there are a lot of tabs of the same site and one of them are playing audio - it is not possible to select the tab - the popup covers the tab under the mouse cursor and I can only add a tab icon instead of select a tab. 2026-09-14_12-01.png When a new modal window is opened (in this case the window to login into Opera's forum), the window bar is totally black with no buttons on it.
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I am on Kubuntu 24.04, KDE Plasma 5.27.12, Opera 135.0.5973.133