Hello Rahul,
I understood that you can't see the button to create azure functions , however once the resource Azure Functions(based on your image you are already deploy the resource) is deployed the functions itself is automatically detected based on your code.
You can follow this quick starter funciton app to check how is this working:
https://learn.microsoft.com/en-us/azure/azure-functions/create-first-function-cli-powershell?tabs=windows%2Cazure-cli%2Cbrowser
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Regards,
Luis