This is always confusing me. When creating layers unchecking made the dimension invisible. But unchecking made the sketch visible. What is reason for that?
In the first instance of the context toolbar, all the icons represent actions: you edit a sketch, you edit a sketch plane, you zoom to selection, etc. and you hide a sketch if it is currently shown or show it if it is currently hidden. So the icon represents what the action will do when selected (either hide or show).
In the second instance of the layer dialog, the icon represents the status of the layer so you can look at the entire list of layers and tell the status for each column; i.e. whether it is currently visible or hidden, whether it will print or not, what color it is, what style it is, or what thickness it is.
So, while the icon feels inverted between the two contexts, it is consistent with how icons are uses within the current context. If the usage was made consistent between the two contexts by inverting it in one of the two contexts, then the usage of that one icon would be inconsistent with all the other icons within that particular context which I think would be even more confusing.
I hope this helps,
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