MoreAlign

VBA code for PowerPoint add-in that provides more alignment methods

Customize Ribbon

customUI/customUI.xml

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
   <ribbon>
     <tabs>
       <tab id="CustomTab" label="My Tab">
         <group id="SampleGroup" label="Sample Group">
           <button id="Button1" label="Stack" imageMso="ChartAreaChart" size="large" onAction="my.xlam!Stack" />
           ...
         </group>
       </tab>
     </tabs>
   </ribbon>
 </customUI>

_rels/.rels

<Relationship Id="someID" Type="http://schemas.microsoft.com/office/2006/relationships/ui/extensibility" Target="customUI/customUI.xml" />

Reference: Microsoft Doc

ToDo

stack rows, columns

spread rows, columns

distribute columns horizontal

distribute rows vertical