When you boot up Solus, and click on the 'files' icon (which is default Nautilus), the window launches and places itself everytime in the center of the screen?
Is that correct?
Cannot duplicate.
When I turn the centering button on (it's off in the pic), my Files window launches centered on screen like yours.
What you are saying is you turned off the centering button, rebooted, and Files still launches in the center?