Fit spline: disconnect control handles?

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https://support.shapr3d.com/hc/en-us/requests/new

After watching the video: Shapr 3D Manual: Drawing Splines / Sketching (@1.28), which showed a point on a spine being selected, and then clicking on the Break/Join badge to enable the control handles to be manipulated individually.
(I am on a Mac desktop, and the video is on an iPad). I don’t see that badge when I select a point, just the lock badge. I want to disconnect the handle so that I can fine-tune the spine. There is a disconnect button on the right side of the screen, but it is grayed out. Thanks in advance for your help!