If u use the Windows Start menù, also when the taskbar is full of icons, the menù always open in the middle and I like to have it in the middle
As others have noted this means you have to move your mouse a long way which is a poor user experience hence why Start11 works as it does.
However there is an option in Start11 for those who wish to work like that.
Open Start11 settings, go to Configure menu, then pick customize visual appearance. Then pick change visual effects on the menu and enable the "Do not offset the menu horizontally to ensure it lines up with the start button". This should then work as you want.