If one uses the subforum search feature, magnifying glass icon upper right. They’ll find the missing shutdown button on Dashboard has been discussed in numerous prior threads along with how unhide the button as you mention. There are also several prior discussions on using SSH to shutdown the v2.x version My Clouds.
https://community.wd.com/search?q=v2%20shutdown%20category%3A105
One can add their opinion of the missing shutdown in the Cloud Ideas subforum where its been mentioned at least twice already.
https://community.wd.com/t/bring-back-the-shutdown-button-to-the-my-cloud-dashboard/177758
https://community.wd.com/t/shutdown-button-on-wd-my-cloud/97124
