Utilities/Customize Screen/ Open the "Commands" tab, choose "Drawing" and look for the icon with the rectangle with an "x" in the upper left corner (7th icon over from upper left). Drag the "Delete one or more drawing objects" icon to your Pro/E menu and place it where you think convenient. By holding your cursor over the icons, the description of what the icon does will appear or show you what it does in your Pro/E text window.
Please note: "Automatically save to" will be checked or should be checked. You might have to change where it is saving your "config.win". The "config.win" must be in your Pro/E startup directory in order to load at Pro/E startup.