How can I unhide a hidden app from the Windows 10 "share list"?

[colormar]

I used the Share by mail of Windows 10 frequently. Accidentally, after pressed the Share button, I right click and hide the Mail app in the Windows 10 "share list" (The one displayed to the right after the share button is pressed). How can I unhide the hidden app? I Need help to solve this problem. Thank you.

The share button in windows 10 is the circle with 3 points. It is found in many app and in the share menu of File Explorer.

OS: Windows 10 Pro
Computer: Surface 2 Pro
Memory: 4Gb

 

[colormar]

I receive this answer in the Microsoft Community - Ask a Question, and it work for me, At last I have mail in the share list;

B-H?rnchen und A-H?rnchen replied on August 20, 2015
MVP Community Moderator Wiki Author MCC: Content Creator
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I don't know of a GUI way to do this.
Go to this registry key
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AppContract\Windows.ShareTarget
There should be one for Microsoft.Mail_whatever ... It controls the states you can choose (pin or hide). If not present it's in the initial state. Delete this key.