Interface Font

Is it possible to change the interface font? how?

Hello @subbu

Please see font parameter of the customization section:
https://api.onlyoffice.com/docs/docs-api/usage-api/config/editor/customization/#font

Pay attention to the note below the description of the parameter.

is it possible to add new font?

Where you’d like to add it? To Document Server in general? If so, yes, here is the guide: