How do I start and stop impressions?

In the Campaigns tab, select one or multiple campaigns.

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

On the Audience segments and interests tab, select audience segments that should be served your ads.

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).