In the default setting of Netro smart watering, your zones will be watered automatically by Netro with smart schedules. You can disable the device while mowing the lawn through Home page->toggle the enabled button and then enable it when mowing is done. You can also create a restriction to restrict watering through Settings->Restrictions.
For more information about Netro smart watering, here is an article about Netro three watering modes which might be helpful. https://netrohome.com/forum/posts/111
Please let us know if you have any further questions.