Hello. Suzanna_029
Thank you for posting and providing details in the Microsoft Community.
I understand that you are opening Word documents with drop-down menus in Word on mobile itself, but this feature is not working in Word on mobile.
We apologize for the inconvenience. Unfortunately, this feature is not currently built into Word on Mobile. Meanwhile, we're glad you asked for this feature, and it would greatly improve the user experience if it were built into Word for Mobile. However, since the Microsoft Community is a technical support community, we encourage you to send your valuable suggestions to the Word team by clicking on the three dots in the upper right corner of Word, clicking on Send Feedback to Microsoft, clicking on “I have a suggestion” and submit your valuable suggestions here.
Thank you for your understanding and support.
Best regards
InaX-MSFT |Microsoft Community Support Specialist