Custom Page Headers

Hello…I have several sites using Rock Star Pro. On one in particular I was able to set different header images on each page. On my most current site, I don’t see in the editor where I can do the same. How would I go about allowing this setting to take place. I’d like to set a custom header image on the following page:

https://classickingdombookings.com/bands/

I’ve already create a graphic, and am using a plugin called “Custom Headers”, but that doesn’t seem to be working. In the older page editor, there used to be a block to pick or set one…I don’t see that anymore. Would that mean I need to reinstate the “Classic Editor” to see this? Thanks!!