In the Web&Map app, a large selection of web services are available for context-sensitive web searches. You can determine which services are displayed in Web&Map's web services drop-down menu.
Proceed as follows:
- In the menu bar navigate to Plugins -> Web&Map -> Preferences...
- Select URL Templates
- Enable or disable the desired services by checking or unchecking the boxes acordingly
How to add your own web services is explained in this article.