Set to true for center-new-windows by default [mutter]

profiles/templates/6_ac_desktop_profile/2-user/gnome-base/Gnome-40.0/gnome

@@ -83,6 +83,9 @@ idle-delay=uint32 900
 [desktop/wm/preferences]
 button-layout='appmenu:minimize,maximize,close'
 
+[mutter]
+center-new-windows=true
+
 [shell]
 app-picker-layout=[{'Multimedia': <{'position': <0>}>, 'Graphics': <{'position': <1>}>, 'Internet': <{'position': <2>}>, 'Office': <{'position': <3>}>, 'System': <{'position': <4>}>, 'Accessories': <{'position': <5>}>, 'Utilities': <{'position': <6>}>, 'Settings': <{'position': <7>}>}]
 disable-user-extensions=false