I believe that's how all thermostats work, whether you control it by the app, Alexa, or manually.
I have a Nest thermostat. When I tell Alexa to change the temperature, it's the same as if I actually walked up to the thermostat and set the new temperature. The preset schedule still takes precedence at its programmed time.
Say at 1:05PM, I tell Alexa to set my house to 75 degrees. My preset schedule is programmed to set the temperature to 78 at 1:30PM. So at exactly 1:30PM, the thermostat will take over and set the temperature to 78.