Resizing Xfc4 settings window (xfce4-settings-4.14.2) allows growing the window's width but not shrink it. The minimal, final window width is that with each category icons in one single line for each category, the longest of which is the first one ("personal" or "personnel" in French). Besides all that the mouse pointer flickers rapidly when hovering over the borders.
The problem occurs whether the profile is blank or not. It doesn't occur with xfce4-settings-4.14.1.
Please check the upstream bugs https://bugzilla.xfce.org/
Add a link here when you found the ticket.
I found the following bug report(s):
* https://bugzilla.xfce.org/show_bug.cgi?id=16276 (dupe of the former but with hints)
Apparently the bug was already noticed with xfce-4.14.1...