The presets are managed in Ableton Live, not in the plugin itself.
The red arrow shows how to access AU and VST3 presets, and the green arrow shows how to get to the VST2 presets:
To save User presets:
If the presets are still missing:
- Close Ableton Live
- In Finder, press Cmd + Shift + G to open "Go to Folder".
Paste this path:
~/Library/Preferences/Ableton/Live 12.0 - Back up your preferences by copying them to another folder or your desktop.
- Go to your actual Live version & delete the preferences .cfg

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Relaunch Ableton Live & reconfigure:
Audio interface, MIDI devices, Plugin folders (re-scan them), Any other custom settings