To delete CollectionEventSeries with no
relation to CollectionEvents
or other event series choose the tab page
Orphaned data -
Series. Click
the List orphaned event series button to list
these series. The detected data will be listed as shown below. In case there are orphaned images
these must be deleted first (see below). Click on the
Delete orphaned event images
and and the
Delete orphaned
event series
button to delete the data.