! Please note that this is a snapshot of our old Bugzilla server, which is read only since May 29, 2020. Please go to gitlab.xfce.org for our new server !

I find no option to center a panel automatically in xfce4-panel 4.10.

With Xfce 4.10 on Fedora 17 (unofficial repo), you can unlock the panel, and move it - it will kind of "snap" when it hits the center.