The alignment for the workspace header label was initially set to 0.4 and later adjusted to 0.44, but I think that it should be actually centered. https://git.xfce.org/xfce/xfdesktop/commit/src/windowlist.c?id=b5d1ce1c99780579a4cc6b3c1be42d75eafd4c8c
Created attachment 8530 patch
Theo Linkspfeifer referenced this bugreport in commit 4033a46b7b4e01b07f4694ab97fea53c98e6d306 Properly center workspace header in windowlist (Bug #15405) https://git.xfce.org/xfce/xfdesktop/commit?id=4033a46b7b4e01b07f4694ab97fea53c98e6d306
Merged, thanks.