
Press Win + R to open the Run dialog, then type "regedit" and press Enter to open the Windows Registry Editor.
In the Registry Editor, navigate to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Office<OfficeVersion>\Common
Replace <OfficeVersion> with the specific version of Office you are using.
In the "Common" folder, right-click on the right pane, and select "New" > "DWORD (32-bit) Value."
Give the new DWORD value a name, for example, "EnableLivePreview" (or the name of the feature you want to disable).
Double-click on the newly created DWORD value and set its value data to "0" to disable the feature. If you ever want to enable the feature, change the value data to "1."
Close the Registry Editor.
You may need to restart your computer or log out and log back in for the changes to take effect.