Centering all windows in XFCE

[forneus]

Hello forneus,

Menu>All>Window Manager Tweaks

Select Tab "Placement"
Tick Radio button "At the center of the screen"
Click "Close" button

Experimental ( I haven't tried it), if you also want the windows to overlay each other and not fill up the entire screen.
Menu>All>Window Manager
Advanced tab
"Windows Snapping", tick box "to other windows"
click close

If it doesn't overlay return and untick "to other windows"

Thanks for the tip, bitsnpcs. Tried the Placement Tab - all windows centered except Thunar file manager and a terminal (both are priority applications). Any ideas?