In the TA graph, when <None> is selected in the lower (indicator) graph, the upper (main) graph should be resized to full vertical space. More vertical space for the main graph should be indeed the benefit for selecting <none> instead of something. Since the advent of 16:9 over 4:3 screen format, graphics tend to be too flattened vertically already, it is a kind of punishment to leave in screen this useless and frustrating black area, when there is already little vertical amplitude available on a 16:9 screen format. Enough vertical amplitude is necessary in graphs to appreciate correctly prices movements, especially in TA.
Thanks