RTE Styles plugin issue in AEM 6.3 classic UI?

Hello Everyone,

Classic UI RTE Styles plugin is not reflecting the options font and format style in the drop-down in AEM 6.3 as it reflects in AEM 6.0, following are image snippets:

When I inspected the Style plugin drop-down option I found that in AEM 6.3 class selector is not present but in AEM 6.0 it is present, following are image snippet:

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In AEM 6.0 each option reflects 'cssName' property for class and value but in AEM 6.3 it reflects for value only.

I referred following docs for RTE Style plugin:https://docs.adobe.com/docs/en/aem/6-3/administer/operations/page-authoring/rich-text-editor.html

https://docs.adobe.com/docs/en/aem/6-0/administer/operations/page-authoring/rich-text-editor.html​

Is it a bug in AEM 6.3 or I need to configure anything for it in AEM 6.3.

Any suggestions would be appreciated.

Thanks,

Arpit Bora