Points in a graph

Is there any way to either hide a point in a graph, or lock it from being dragged?

If you want to hide a point, you can click on the colorful dot to the left of the expression. The color will turn off, meaning the point is now hidden.
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If the coordinates are variables, the point will be movable. If you long press on the colorful dot, a menu will pop up. One of the options is to turn off the ability to drag the point.
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@cwinske is definitely correct on the best way to do those two things.

However, @SeanMaths4EAL, if you need things to be a little more dynamic or need some strange workaround for whatever reason, here are two tricks that I’ve used in the past…
https://www.desmos.com/calculator/cssw2s2hlm

Yes, I meant in code.

Yey. Worked out a way of achieving what I want.

https://www.desmos.com/calculator/nhbid1jmpa