If you require to pin an opened flow tab in your organization, click on the highlighted 3 dots in the tab as illustrated in the image below.
This feature is helpful when you want to keep referring to one or more flows while opening other flows. Please note that you can only pin 2 flow tabs at a time.
The below Pin option will appear as per the below image. Click on it to pin the flow tab.
All pinned flows will have a blue flag on the top left corner of the flow title as shown in the image below.
You can unpin a flow tab by clicking on the dots and clicking on “unpin”.