Do I have the option to hide the "" button on the Ribbon? FAQ Link


However, you can disable the button. Therefore you have to insert to your XML some lines of code as shown in the example below:

Example XML:

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
<!-- Insert here -->
    <command idMso="Help" enabled="false"/>
<!-- Here your code is going on  -->
   <ribbon startFromScratch="false">
        <tab idMso="TabHomeAccess">
           <group id="myGroup" label="My Group" insertBeforeMso="GroupViews">
              <button id="myButton" label="My Button" imageMso="HappyFace"/>