I have a situation with the panel in XFCE (13.1). See photos for clarification:
Both photos are from the same desktop, but two different workspaces. In fact, each of the five
workspaces are different. The problem is that the applets on the panel do not occupy all the width
of the screen, except on one worskpace.
I tried dragging the rightmost applet to the right, but it refuses.
Cheers / Saludos,
Carlos E. R.
(from 13.1 x86_64 “Bottle” (Elessar))