To switch a device from DTH to an Edge driver, you would need to remove the device from ST (exclude), add the appropriate Edge driver (or allow the stock driver to be installed) and add the device back. To add — Add Device > By device type > Z-Wave (when any device is z-wave).
I would suggest installing the following Edge driver for Schlage/Kwikset/others [ST EDGE] Z-Wave Lock PH - Devices & Integrations / Community Created Device Types - SmartThings Community. If you have a Schlage lock, there is a beta version in that channel that fixes lock code names being reset and exposes lockCodeName as a trigger in Routines.
There is no way to switch from IDE, ST app, CLI or API Browser+. Please do not attempt to edit devices in IDE - whether trying to convert to Edge or devices already using Edge drivers.