I think we have some miscommunication happening here. Do I guess correctly that English is not your first language?
The visibility on/off checkboxes in the Layers Window are always “live”. They can be changed at any time, regardless of what you have or have not done in Entity Info - with the sole exception that you can’t hide the current “active” layer. But a layer’s visibility setting affects only those Entities that are associated with that layer
You set or change the layer association of a selected Entity (or set of selected Entities) using the Entity Info Window.
So, in that sense I suppose one could say they are “linked” in that you have to assign a layer using Entity Info before the layer can affect the visibility of an Entity. Sorry, but that’s like saying “I have to paint my car red before it looks red”.
By the way, it sounds like you need to read up on SketchUp’s layers to avoid getting into very confusing situations later. They are not at all the same as 2D drawing layers or Photoshop layers, and thinking of them that way will lead you to problems. Suggested reading: