I bought a pre-owned MacBook Pro running macOS Mojave 10.14.3. I tried to changing Trackpad preference as per my convenience, but it appears that while changing the option on left side, the video demo shown on the right is not playing. Usually it does in other systems.

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How do I enable it?

  • Welcome to Ask Different :) It's possible that it may be happening due to some minor bug. Consider upgrading to the current public release, macOS Mojave 10.14.5 and see if it fixes the issue. – Nimesh Neema Jun 18 at 1:12

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