Hi @sab-f ,
Welcome to Q&A forum!
As DougRobbins said, this is the "new experience" that are "coming soon" for Microsoft 365 for Apps. Please try to modify the following registry key to cancel the application of this new experience:
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
The same operation also applies to 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. Any updates, please let me know.
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