Yes, you can remove/delete the picklist field from One Click Update after configuration.
Steps to remove the field:
- Go to the About One Click Update tab in the one click update app.
- Go to step 1 > Click on Recycle Bin icon in the Action column for the field which you want to remove.
- After clicking on Recycle Bin icon it opens PopUp - Click on the OK button in PopUp.
- Now you can see the field is successfully removed.