Lightning Experience: Can Tabs be customized by end users?
|Knowledge Article Number||000240869|
|Description||In Salesforce Classic, end users are able to use the "customize my tabs" feature to fine tune the display they would like to see.|
|Resolution||Lightning Experience does not yet support this functionality.
Any Tab customizations end users have made in Classic will not be reflected in Lightning. The settings the Administrator has made will be what all end users see.