When attempting to delete a data frame, you may encounter the following error:
Failed to delete the data frame. l.startsWith is not a function
This is a known issue where data frames imported using “Import & Merge” cannot be deleted.
To resolve this issue, you can change the target data source from the “Import & Merge” one to a different data source from the data source menu, and then you should be able to delete it.
This issue is expected to be resolved in a patch for Exploratory Desktop version 13.9 and later.