Some people's Office 2021 may have a new look, and some may not have received an update. Let's share how to force the new UI. Create a new text file, copy and paste the code below into the text file, change the file extension to .reg, and run it to add it to the registry.

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides]

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\access]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\excel]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\onenote]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\outlook]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\powerpoint]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\project]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\publisher]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\visio]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\word]

"Microsoft.Office.UXPlatform.FluentSVRefresh"="true"

"Microsoft.Office.UXPlatform.RibbonTouchOptimization"="true"

"Microsoft.Office.UXPlatform.FluentSVRibbonOptionsMenu"="true"