AEMaaCS environment name update

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The confusion is because both the values are coming ? or any one of the value is not correct ? From the screenshot it is not very clear. 
But in theory, I don't think you can change the OOTB value as it represents the environment type. 
On the other hand, if it is acceptable then what you can do is disable the unified shell altogether which will disable the unified experience for other experience applications
https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/overview/aem-cloud-service-on-unified-shell#disabling-unified-shell 
Hope this helps.

@prajwalre 

Here are couple of documents related to update environmental variables

https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/implementing/using-cloud-manager/environment-variables#update-variables

https://github.com/AdobeDocs/experience-manager-cloud-service.en/blob/main/help/implementing/cloud-manager/environment-variables.md#adding-environment-variables-add-variables