Hi @shehan!
I opened the GraphQL Explorer in your space but noticed the fields in the banner model were deleted and there isn’t any content created, so I’m unable to test this on my end. I was able to query the custom fields on your page model though below. If you add the custom fields back to the banner model, I’d be happy to investigate further on why the fields weren’t showing.
We also have another forum post with suggestions when new fields aren’t appearing that may be helpful.