Actually this feature was not enabled by default in your system, AniExplorer will enable this feature on your system, it will not install or add anything on your system but it will just unlock this Animated Explorer UI on your system.
To use this tool all you need to do is download and extract the tool, just run the appropriate version of it according to your Windows. After its launch just select in which way you wanna see your explorer animation and then select the speed of animation and then click on Apply, it will restart your explorer and after which you will get animated explorer.
If in future you wanna roll back then just click on Restore Default and you will get old thing back.
To know more about this tool take a look at the video below :-