To Delete an Icon

In the Customize dialog ( File > Settings > Configuration > Customize ) click the Icons tab.

In the Current File Icons list box, select the icon to delete.

Do one of the following:

Click Delete Selected Icon(s) to delete all sizes of the selected icon.
In the Icon Properties pane, right-click the single icon size that you want to delete and select Delete from the pop-up menu.

Tip: If you want to delete multiple icons, select multiple icons in the Current File Icons list box. When you click Delete Selected Icon(s), all sizes of the icons will be deleted.