The sub-domain en.seoartgallery.com hostname (DNS record) should be proxied and set to .
Therefore, you can create a new Page Rule for that specific sub-domain like sub.domain.com/* and select the features (options) which you want to enable or disable for this specific sub-domain.
May I suggest below article as it contains all the useful information about Cloudflare Page Rules.
Furthermore, from your above screenshot, I see there could be some issue with the following sub-domains:
www.artist
www.en
www.ja
You might want to use Advanced Certificate Manager to cover those sub-domains with the SSL certificate, otherwise you might have an issue as follows: