A family of Microsoft word processing software products for creating web, email, and print documents.
Dear respected HarshadG92.
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem but based on your description we can work together to resolve it.
For the situation you encountered, we deeply understand the inconvenience caused and apologize for it.
As per your description, the option "Switch Mode" feature (View> Switch Modes from the ribbon) appear when users running Word Version 16.49 (Build 21050201) or later on Mac OS.
As you are using Word version 16.42 (20101102) and that's why you didn't see the "Switch Mode" feature option from your end.
However, as a workaround in your Word version have you tried go to Design > Page Color and select the black color.
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Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad