Hi @강민아 ,
Did this issue appear recently? Did you install any updates?
I suggest you go to Excel- About Excel, and provide the detail version number as shown in the following picture:
You can try to troubleshoot Office for Mac issues by completely uninstalling before you reinstall, please refer to this support article:
https://support.microsoft.com/en-us/office/troubleshoot-office-for-mac-issues-by-completely-uninstalling-before-you-reinstall-ec3aa66e-6a76-451f-9d35-cba2e14e94c0
Try this method and let me know if it will help, please let us know if you would like further assistance.
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