This is the action you need to set in case you want to keep only top performing adsKeep top performing ads
Under the Ad group column, you will find the action to keep top performing ads (from 1-10 ads) and choose by which metrics you would like to optimize:
After saving, ads that will be affected will turn to bold.
Head over to execute the task or scheduling it from the Publish:
Execute/Scheduling a task > Save the view:
Execute will run the action once.
Scheduling a task will run the action on your selected time frame.