It’s not clear to me. How exactly do you want the behavior to be?

Say the checkbox is checked, so the loading is enabled. How exactly should this template behave. The line starts appearing? How much time does the animation of the appearing last? When does the unloading start? From what end does the unloading start?

The way you explain it, if the…

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The unbuilding starts after the whole path is loaded? Or does it break it? If you have 3 lines complete and start to “undo” the line from other point than the first, then you would have 2 lines.

So does this unbuild start after the entire lane has appeared?

Well, if you try to prevent someone from moving the layer, you should add an expression to position, not to anchor point. Try this on position:

[thisComp.width/2, thisComp.height/2]