I was looking in the wrong place. However, changing the settings doesn't seem to have made any difference. like you said, limited success. I guess it's just one of those irritating little things you have to live with, like the yappy dog in the flat downstairs!
I found this: http://www.theeldergeek.com/tool_tip_displays.htm
but he loses me after "advanced." I click on advanced and I get all the stuff on the right hand side and then what?
Many thanks for your help.