Hi @Uri7337, welcome to the forum! 
You should be able to enable this from Advanced settings:
However, this is for the App index. No updates yet on the FR for subfolders within an App.
@antonybello Can you please enable it for my org (stackdrop.co) 
Hi @Omar_Tarek, we should be able to find this under Advanced settings:
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Can you enable this for my org please? (moorhousecoating)
Everyone on Cloud should be able to find the Beta feature under org advanced settings.