How to allow third party cookies in Safari 11.0.3 (13604.5.6)

I cannot find a way to allow third party cookies in Safari 11.0.3 (13604.5.6). Previous versions had a 'always allow' in privacy tab like the picture below

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While(13604.5.6)has this privacy tab:

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Unticking the "Prevent cross-site tracking" is what enables the use of third-party cookies.

"Tracking" in this context refers solely to third-party cookies.