If you want just to change the default to something else, you can choose another option and save with current variables - that will not clear the default, just change it.
To reset the default:
This is useful if you saved a dropdown list to a value for consistent debugging while developing, and now want to release with the first item in the list, which will chosen by default (if it is clear).
Note : Simply using Save and publish
will still retain the older default value, so above steps are necessary.
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