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Any Jira or System admin can delete screens. Go to Admin -> Issues -> Screens for the list of all screens in your system.
You will find a "delete" option on the right for any screen that is not active in your system. You can't delete the ones that are in use, because they're being used. This list of screens includes the data of where they are being used.
You might want to visit "issue type screen schemes" and then "screen schemes", deleting any schemes that are not in use - this will mark the screens in them unused as well.
@Nic Brough _Adaptavist_ Thank you very much for your quick response,
I verified all the screen schemes there is no associated screen to particular screen schemes, but Delete option isn't visible.
While importing working flow the screens automatically created i updated the all the workflow as well, but still i am unable to find the delete option in screen page
Please do the needful for us.
If there is no delete option, then the screen is in use somewhere.
Could you show us an example of a screen that appears to have no delete option from the list of screens?