Follow this procedure to manage metadata.|
At the top right of the screen, click on the icon representing an avatar, then on Administration.
In the left column, click on Manage Metadata.
To add an instance of properties to the already existing list, click Add another.
To disable pre-configured metadata (difficulty + duration) when writing tutorials, uncheck Enable the "Difficulty" property (filter+form) and/or Enable the "Duration" property (form only).
Click Save to apply the changes.