Remove item from ECB in SharePoint 2013 or Remove Delete item in Edit Control Block

Solutions

1) If you simply want to hide, use the following CSS by adding in script web part  

2) Java script ( not tested)

source

https://sharepoint.stackexchange.com/questions/114587/remove-item-from-ecb-in-sharepoint-2013

Related  links

https://social.technet.microsoft.com/Forums/Lync/en-US/e91554ed-d057-4185-b1e7-e924f6eb79a4/how-to-hide-the-delete-item-option-from-the-list-item-menu-in-sharepoint-2010?forum=sharepointgeneralprevious

http://www.learningsharepoint.com/2013/05/09/sharepoint-2013-callout-popup-tutorial/

https://docs.microsoft.com/en-us/sharepoint/dev/spfx/extensions/guidance/migrate-from-ecb-to-spfx-extensions

http://www.learningsharepoint.com/2013/05/18/hide-callouts-in-a-sharepoint-2013-task-list/