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Ramana123Ramana123 

why we dont't have validation rules and pagelayouts on custom settings , why they are in custom meata data

VinayVinay (Salesforce Developers) 
You can use custom settings in validation rule.  However, this is salesforce architecture.

You can always post your Idea below and vote for this feature.

https://trailblazer.salesforce.com/ideaSearch

Thanks,
Ramana123Ramana123
Hi vinay, Thanks for the support but the question is why we can' write validation rule on custom setting object .
VinayVinay (Salesforce Developers) 
This might be on the road map in coming releases but for now I do not have answer why validation rules are not available on custom settings.

Raising an Idea can help you and considered for coming releases.

Thanks,