How do I start and stop impressions?

On the Campaigns tab, select a single campaign or multiple campaigns.

On the Ad groups tab, select one or multiple ad groups.

Select your retargeting lists and mobile app interests in the Retargeting and interests tab.

In the Inspector Edit section, select an action in the State field.

Press Ctrl + S (Cmd ⌘ + S on MacOS) or click the Save button at the bottom of Inspector.

To apply the state change, upload the campaigns to the server (All data option).