Hi @Tran Bui The , thank you for submitting a question. It sounds like you're describing a bug with the Outlook JavaScript APIs for MacOS. We use GitHub issues to track bugs with the APIs. To report this issue, I recommend going to https://github.com/OfficeDev/office-js/issues, selecting "New Issue" and following the prompts to describe your bug. Then we'll assign the issue to the engineering team to help resolve.
Hope this helps.
Alison