Q. [R Product] Can I Change the Appearance of Multiple Buttons at Once?
A.
Yes, you can change the properties of multiple objects of the same type at once by selecting them together and using the [Property Window].
To open the Window Property, go to [View] - [Property] from the top menu. It will appear as a Dock Window on the right. 
To keep it fixed, click the pushpin icon next to the [X] button, as shown below.
 
 
Simply drag to select multiple objects of the same type, then edit their properties in the Property Window — changes will be applied to all selected objects.
This is especially useful for batch-editing Button Images, Text Colors, and other visual attributes.