From the Diagrams tab, you can open a diagram by using these methods:
Click the diagram title in the list.
Click the three dots next to a specific diagram in the list and choose to open it in the same tab or a new tab.
Click the arrow next to a specific diagram in the list to open it in the same tab.
When working on a particular diagram, you can access all diagrams by clicking the folder icon in the top-left corner.
Choose the diagram you want from the list, and click Open in the bottom right to open it.