The Plist file above is located at ~/Library/Preferences/com.googlecode.iterm2.plist but the file is binary and not XML.
To edit and replace the XML I recommend using Visual Studio Code with the extension Binary Plist
.
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=dnicolson.binary-plist
The steps bellow are not needed if the settings file is replaced.