In the Director's Vault I don't believe there is a way. However, under your Collections,, under the model's name are 3 icons. A silhouette of a person that list the Director's name, a heart so you can favorite the video and a = sign which allows you to hide the video. Try hiding the video on your collections and maybe it will disappear in your vault as well. I know in your vault you can hide your directed videos, but this is the only way I see how to hide videos you haven't directed.
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