Comment 6 for bug 1874954

When attempting to resize the Settings Manager window, you can resize height-wise in both directions. However, when resizing width-wise, you can only make the window grow, it will not shrink. You need to either use xfconf-query to affect the /last/window-width setting (while the manager is not running) or delete the xfce4-settings-manager.xml to reset to default.