Hi @Dhamodaran, Shahini (HM Health Solutions Inc) ,
if you are using the classic experience list view, you could CSR to change the column header background color.
Demo code:60390-code.txt
Test result:
For the modern view, as far as I know, the JSON formatting only supports hideColumnHeader.
custom-header-format.json
There is a UserVoice about this, you can vote it, if a UserVoice is high voted there by other customers, it will be promising that Microsoft Product Team will take it into consideration when designing the next version in the future.
If the response is helpful, please click "Accept Answer" and upvote it.
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