Scanning -> LsAgent scanning -> select your configuration tab
If you have more than one group, each group will have its own configuration tab.
You can set your scan schedule there.

If you are using lansweeper cloud - do not forget to enable the Relay Service, on the Relay configuration just below the lsagent scanning.
This is also where you get your key that you must pass through during install for lsagent to work with the cloud.