Shared Workbook Server Joined Devices

Left click on the Ribbon and click on customize ribbon bar.  Then click on "Review" and then click on New Group button. 

Once done, please choose "All Commands" from the list "Choose Commands from" and search for 

"Share Workbook" from the list. Once you have identify it, click on "Add" (This will add the command in the new custom group". At last, click OK.

https://learn-attachment.microsoft.com/api/attachments/468934e0-3a9f-4940-903a-2c478b287fd7?platform=QnA