Hi @Anonymous ,
You need to give user "Execute" permission to view the contents of the external list. More information, please refer to this articel.
Steps:
1) Sign in SharePoint Central Administration >> click Manage service applications >> select the Business Data Connectivity (BDC) Service and click Manage
2) On the Manage page, check the external content type and click Set Object Permissions >> type user and grant permissions
By design, you cannot save the external list as a template.
Thanks,
Echo Du
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