Hello there!
The client machine will automatically be scanned by LsAgent, by default, once per day. So when no scan schedule is selected, you will indeed scan the asset once a day.
You can change the machine's scanning schedule in the Scanning > LsAgent Scanning section of the Lansweeper web console. Keep in mind that the minimum scan interval for LsAgent is 4 hours. If you choose a more frequent schedule, your LsAgent installations will silently default to an interval of 4 hours. LsAgent uses the same schedules as deployment packages, so the link for creating a new schedule takes you to a deployment configuration page.
In the Scanning > LsAgent Scanning section of the Lansweeper, you can divide machines scanned with LsAgent into groups, configure a scanning schedule for each group, and enable/disable/delete LsAgent installations. You can disable an LsAgent installation if you do not want it to send scans.