Hi @RYU
According to your image, it seems that your Excel uses a new interface that are "coming soon" for Microsoft 365 for Apps
Currently, I would suggest you try following steps to have a check.
Go to Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\excel, change the following three key values to false.
- Microsoft.Office.UXPlatform.FluentSVRefresh
- Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu
- Microsoft.Office.UXPlatform.RibbonTouchOptimization

If needed, the same operation for Word (Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\word) and other Office apps.
Hope the information is helpfu to you.
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