I found this bug by accident and enlarged my settings-manager window to display 5 columns of icons instead of the 4 that showed before.
It is now impossible to reduce the size back to what it was and editing the ~/.config/xfce4/xfconf/xfce-perchanne-xml/xfce4-settings-manager.xml does not shrink it either; it is now fixed at the 5 icon width.
I found this bug by accident and enlarged my settings-manager window to display 5 columns of icons instead of the 4 that showed before. xfce4/xfconf/ xfce-perchanne- xml/xfce4- settings- manager. xml does not shrink it either; it is now fixed at the 5 icon width.
It is now impossible to reduce the size back to what it was and editing the ~/.config/