How Do I Edit Diagrams? To edit diagrams, you should first ungroup them; Open a PowerPoint presentation and navigate to the appropriate slide. To ungroup diagram Select the diagram you want to ungroup. Right-click the mouse. Select Grouping > Ungroup. PowerPoint ungroups the object. To group objectsSelect the objects you want to group. (Press Shift as you click on the objects. Press Ctrl and right-click the mouse. Select Grouping > Group. PowerPoint groups the objects into a single object. Stylish templates can be a valuable aid to creative professionals. Each work is featured with simplicity but supreme beauty.