To create a Preset, please follow these steps:
Go to the Timer tab (middle icon) at the bottom of the screen.
Customize your session by setting the Duration, Interval Bells, Ambient Sound, and Ending Bell as desired.
Tap the three dots (⋯) beside the Play icon.
Select Save as Preset from the menu.
Enter a name for your Preset.
Tap Done to save your settings.
Your Preset will now be available for quick access in the Timer.