To Modify Symbol Size
1. Select a symbol to modify. You can use the Diagram Item or Symbol filters to select the required symbol.
2. Click Edit > Properties. The EDIT CONN and CONN VIEW menus appear.
3. Click Resize from the CONN VIEW menu.
4. Enter a value, for instance, height. Diagram displays the current value as the default and rescales the symbol.
If the symbols are defined as Fixed, you cannot modify them.