Why is "Delete" command disabled for experiments?

Why is "Delete" command disabled for experiments?

Make sure that configuration of parent collection type (e.g. Notebook) allows deleting child collection type of your experiment (e.g. Discovery Biology):

1. Go to configuration of your parent collection type, e.g. in version 13.x it would be Everyone -> Configuration -> User -> Base Platform -> Collection Types -> Notebook -> [right-click] -> Collection Type Configuration -> Contained Collection Types -> Discovery Biology -> select "Discovery Biology can be Deleted from Notebooks" -> close the dialog.
2. Click "Save" in the top-left corner of the application window.
3. Go to "Data" tab in the menu -> Refresh All.