As you close tabs in Dolphin tabs they move each time you close one, making it so you have to "chase" the Xs. Expectation: at the very least the tabs should wait until I leave the tab bar to move... best yet would be to have it so the next X moves to where the old one (from the closed) window was. Hard to do with the Xs on the right of the tab. In the video I show another UI where this works great. Reproducible: Always
The tab widget is provided by the Qt library. Please report this issue directly to Qt developers via https://bugreports.qt-project.org/