You may have just updated your Adobe Creative Cloud and discovered that your presets are missing in Media Encoder. Here is how to get them back.
Your custom export presets from 22.0 are all still there, but you’ll need to manually transfer them to Media Encoder 23.0.
You can do this by navigating to the \Users\[username]\Documents\Adobe\Adobe Media Encoder\22.0\Presets. Copy the contents of the Presets folder and paste them to \Users\[username]\Documents\Adobe\Adobe Media Encoder\23.0\Presets.
Unfortunately export presets are not part of sync settings process and need to be transferred manually.