I prefer to have a single panel horizontal on the left hand side and would like to have a single column of "desktops", perhaps four. The current desktop pager has one row two columns wide. Can I customize this, and, if so, how?
Did you mean a single *vertical* panel? If you right-click on your panel, choose Add New Items and select Workspace Switcher, this plug-in has a Number of columns option in its Properties, and you can have a 1-column vertical stack of all your workspaces.
If you meant *horizontal* panel, the same thing applies, but this time the Properties choice is number of rows of workspaces.
pardon both on meaning vertical and writing horizontal, and on the fact that this problem was with lxde and not xfce.