A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi christinecheng,
As per your description, based on my test result the “more error bar” options is available in Excel version 16.54. See image below for your reference:
As you mentioned, “I am using Excel 16.51 for Mac” and you Office 365 version is not up-to date, so please first of all please make sure your Office apps are fully updated. The latest version of Office 365 for mac is 16.54.
Since you Excel version appears lower, you may manually update Office apps, click Help > Check for Updates from any of the Office app to get the latest build.
For some reason if Office apps still didn’t update, then please download the Update packagefrom this article, then open Excel file and check the outcomes.
May I know which chart type you are using? please make sure you are using Scatter Chart type.
Also, please try to operate a safe boot for Mac then the outcome. To operate the safe mode is to determine whether background programs are interfering with Office for Mac.
If issue still persist and issue with all Excel files even new created Excel document on your Mac OS, then I suspect components were corrupted somehow. You can go to the Applications folder In Finder and drag Microsoft Excel.app to the trash. Then Restart your Mac Download this installer Install package and use it to reinstall Microsoft Excel (the latest version 16.54). Then, restart your Mac and test.
If above suggestion does not work for you, please feel free to confirm your MacOS version.
I appreciate your understanding and stay safe!!
Best Regards
Waqas Muhammad