Originally Posted by catkin
Thunar->Edit->Preferences->Behaviour and change from "Single click to activate items" to "Double click to activate items".
That was the first place I went, to set it to single click. There was no tab that mentioned underlining
Of course - it being Xfce, you have to double-click the desktop icon, no matter what. Single click then works for icons within the window.
Thunar comes with good reviews about being low impact on resources, and fast, etc. It looks very much like Nautilus on the face of it, though I dare say there are feature differences and capablilties.