You can set default locations for searches.
To set search sources:
On the Preferences page, select the Search tab.
Select the default locations for searches:
My Favorite Repositories:
This sets your default search locations to all the repositories in your default repositories list. You can view or modify your default list in the Repositories tab in Preferences.
Current repository only:
This sets your default search location to the repository that you are currently viewing at the time of the search.
Other:
This sets your default search locations to specific locations you select.
If you selected Other, navigate in the Available Repositories list to the location you want to add and select it. If you are prompted for your user name and password, enter these. Click the right arrow. Repeat this step for as many locations as you want to add.
To remove a location from the Included in Search locations, select it and click the left arrow.
To save your changes, click OK.