I’ve heard from the support team – response below:
Thanks for your email. We’ve two methods to add banner image
1) Globel Method:
You can goto WordPress >> Apperence >> Customizer >> Header Image and add header image there. This applies to overall site page/post and archive page as well.
For reference: https://prnt.sc/iaico4
2) Single Page/Post:
You’ll find “Single Page/Post Settings” option filed on each page/post. To enable kindly choose “Check To Use Featured Image As Banner Image”.
For reference: https://prnt.sc/iaicjp
Note: Single Page/Post setting option overrides Globel Method.