Switch the Power Supply Using the Push Button Start and Start the Engine
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
By pressing the push button start under the conditions shown in the table, the ignition can be switched.
Courtesy of MAZDA MOTORS CORP.
*1: To switch the ignition to ACC or off from ON (engine on), the vehicle speed must be 5 km/h {3 mph} or less.