There are many different plugins available that allows you to hide or edit WordPress Howdy message which shows up on the top right corner or admin bar and is visible only to logged in users. This tutorial explains you how you can change that Howdy message and add some greetings depending on the time of the day. For Example: If its morning time the plugin will display Good Morning message as shown in the given screenshot.
There are many features in WordPress that doesn’t provides you any admin area setting and option pages. WordPress Helpers plugin opens up those missing settings you wish were there in WordPress and gives you control over them.