It is possible to change the icon for Entities in a couple of ways. If you select the item in the Diagram or in one of the various Lists, you can then double click the icon of the object in the Item Editor. As a result, the Icon Selector dialog is shown. To change the icon, you simply have to double click on the desired size and choose a picture to load in PNG, JPG, or SVG format. If no picture has been selected for any other size, it will be replaced with the new one.
Another possibility to change the icon of an Entity, is to use the context menu, by right clicking on the Entity and then selecting Change Entity Icon. As a result, the Icon Selector dialog is shown again, and you can choose a new icon for the Entity.