Use analyse mode
Analyse mode helps you identify potential weak spots in your operation by visualising barriers through a selected metadata type. For example, you can colour-code barriers by Barrier Condition to quickly spot weak barriers in a large, complex diagram, then take action to improve them.
Before using analyse mode, add metadata to your barriers. Not sure where to start? See Diagram metadata.
Step 1: Click ANALYSE in the toolbar.
Step 2: Select the Metadata Type you want to analyse from the dropdown. Tick Greyscale Elements or Highlight Critical Barriers if you wish.

Your diagram now looks like this:

Step 3: To stop, click ANALYSE, then STOP ANALYSIS.
