How can I prevent people from sending me referral requests on LinkedIn?

Example of referral requests on LinkedIn:

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Some irrelevant links that I’ve found:

  • https://www.linkedin.com/help/linkedin/answer/70 "Control Who Can Send You Invitations". Doesn’t mention referrals.
  • https://blog.linkedin.com/2018/march/19/introducing-ask-for-a-referral-making-it-easier-to-find-your-way-in: doesn’t say how to block referrals.