Dear Hannna.M,
Good day! Thank you for posting to the Microsoft Community. We are happy to help you.
As per your description, it seems that you are having concerns with Word on Mac, specifically with not finding the Developer tab and the toolbar disappearing randomly.
Generally, the Developer tab is available in Word for Mac and the Word desktop app on Windows devices but needs to be added manually to the ribbon. If you are having concern with Word for Mac, please follow these steps to check the outcome:
- Navigate to Preferences > Ribbon and Toolbar.
- Select Customize the Ribbon.
- Under Main Tabs, check Developer and select Save.
For your reference: Show the developer tab in Word - Microsoft Support

Regarding the toolbar disappearing randomly, to help you better, we would like to collect more detailed information about your experience so we can conduct a further investigation:
- Are you having issues with Word for Mac or the Word web app in a browser? Would you please share some screenshots of the issue encountered with us?
- Are you having issues with a work/school account organized by your organization? Do other people in your organization encounter the same situation?
- If you are having issues with Word for Mac, please share your Word version by navigating to Word > About Word. For your reference: What version of Office am I using? - Microsoft Support
We appreciate your understanding that sometimes the initial reply may not resolve the situation immediately. However, we can work together to narrow down and resolve the issue. Please kindly provide the requested information so we can focus on your specific scenario and offer tailored suggestions.
If the above understanding is not consistent with yours, please feel free to post back and clarify.
Your understanding and patience are highly appreciated. We hope you are keeping safe and well!
Sincerely,
Rhoda | Microsoft Community Moderator