How to use the "Do not Disturb" mode?

WARNING!!

From iOS 26, the feature  "Do Not Disturb" doesn't work anymore for the incoming calls on the professional landline number. The evolutions of the iOS system don't allow us anymore to propose this feature as we expected.

The feature will then disappear from the app and the My landline menu from version 7.2, waiting to be able to propose an alternative very soon.