Selecting items on a diagram
You can select an item on a diagram if you want to change its properties, or you can select multiple or all items on a diagram, if you want to change common properties of the diagram items. When you have selected a number of items on a diagram, you can invert the selection, so that the items that were not selected are selected and vice-versa.
To select a single item on a diagram:
Click the required item.
The item is selected and you can change its properties it through the Property pages.
To select multiple items on a diagram:
1. Click the first item.
2. Hold down the Shift or Ctrl key and click the other items you want to select.
Alternatively:
1. On the diagram tab, click the 
Selection button.
Selection button.2. Drag the selection box to encompass all the items you want to select.
 | After selecting multiple items you can change common properties in the Property Pages. |
To select all items on a diagram:
On the Find tab, click 
Select All.
Select All.Alternatively, you can hold down the Ctrl key and press A.
To invert the current selection:
On the Find tab, click 
Invert Selection.
Invert Selection.