That Icon indicates that it is a plain pixel Layer.
Maybe you should change the Layers Panel’s Thumbnail Size in the Panel Options.
I CoulDn't understand what you mean.
The problem is that I need an empty layer with an empty box I can't find a way out.
In the Layers Panel Layers are represented according to the Panel’s Panel Options.
That in the settings you chose a pixel Layer is represented thusly does not mean the Layer displays an illustration of a Brush – or is one visible on the Canvas?