1. Normal mode: Brief, size=16x16.
2. After changing icon size to 32x32.
3. After pressing Ctrl+F1.
4. Changed icon size back to 16x16.
5. Again pressed Ctrl+F1.
So, the tab-position seems to change though I switch with Ctrl+F1 from Brief mode into Brief mode.
![Smile :)](./images/smilies/icon_smile.gif)