The main view of Execution Set shows you all execution sets you have created as well as a detail pane on the right side which displays various information about each set.
The detail pane shows you the following:
Edit settings: Allows you to edit the execution set to add or remove tests or make any other modification you like. You can also hover over the row of the execution set and click the gear icon (highlighted below) which will open the same edit window
View Execution Results, Cloud Run and Cancel Cloud Run icons are located next to Edit Settings which allow you to quickly view results or start or cancel a cloud run
Recurring Portal Runs: This shows you a toggle you can use to enable any scheduled executions in the future. Edit Schedule will allow you to change the schedule (Same edit window as in point 1).
Next Portal Run: This shows you when the next run is scheduled to start. You can also see the same value under Schedule column in the table
Last 5 Execution Results: This part of the detail pane shows you the last 5 results in the execution set.