How to view the controls used in ppt and how to delete them? I use the 2003 edition.

You can see the control directly in the ppt page. Generally speaking, controls are square. I wonder if there are any transparent controls or something. Even if there is, Ctrl+A can select all the contents on a page and remove some text boxes or something. If you don't know what they are, deleting a control is very simple. Click the edge of the control with the mouse (in the selected state) and delete it directly.