This tab is used to start and stop Burp Spider, monitor its progress, and define the spidering scope.
Use these settings to monitor and control Burp Spider:
The display also shows some metrics about the Spider's progress, enabling you to see the size of the in-scope content and the work remaining to fully spider it.
All content discovered by the Spider is added to the main suite site map.
This panel lets you define exactly what is in-scope for the Spider to request.
The best way to handle spidering scope is normally using the suite-wide target scope, and by default the Spider will use that scope. If you need to define a different scope for the Spider to use, then select "Use custom scope". A further configuration panel will appear which functions in the same way as the suite-wide target scope panel. If you have selected to use a custom scope and you send any out-of-scope items to the Spider, then Burp will automatically update this custom scope, rather than the Suite scope.
Get help from other users, at the Burp Suite User Forum: