This article refers to campaigns that are tracking the same search engines for all keywords. For campaigns with keyword-level search engine tracking enabled where search engines are defined per keyword, see this article instead.
You can modify the tracking search engines of a campaign at any time. To get started, navigate to Search Engine Settings, which can be found under Campaign Settings in the left navigation.
Remove a search engine
To remove a search engine, simply click the "-" button next to the search engine you'd like to delete.
Add a search engine
Click the "+" button at to the bottom of the list to add a new search engine.
This will add a new blank row. Choose a search engine, region, language, device and location.
When you are done making changes to search engines, be sure to click Save changes to apply the new settings.