This issue, no shutdown button in v2.x firmware, has been discussed in several prior threads. There is a bug in the v.2x Dashboard HTML code that hides the Power Off button in the v2.x Dashboard. Please see the following threads for potential workarounds. So far WD has ignored fixing this issue (it is a stupid simple 5 second CSS/HTML code fix) in the past several v2.x firmware versions.
https://community.wd.com/t/safe-shutdown/147307/37
https://community.wd.com/t/how-to-safely-shutdown-mycloud/155265
