PS brush problem

In general, choose a brush, the mouse will be moved to the paper, should not in the paper show the corresponding graphic brush them?!
However, the problem is that PS Our shrimp for the election of a brush, the mouse will be moved to the paper, the results of a cross a small icon ah?!
Back to show how the brush outline of the formation of the graphics do?! Will be teaching next to us!

issue of how simple is not the case by holding down the button to switch the PS in what the press F5 to amend the density of brush.
on the election will not be reset brush right ah, capital letters click on the button to lock the