>In the Property Sheet, use the drop-down list to choose the control you want to delete. Then click on the title bar of the form or of the Form Designer. Be careful not to click on the form itself—that'll change the focus. I tried removing superfluous column controls, and columns, this way. In both cases it didn't work. I want to do both, but mainly get rid of some columns.

That works for me, what version are you using? VFP6 SP3.