Press a button use the Shield

In PC you could adjudgment the configuration from the keyboard and the mouse, even pressing the key or button of your preference get to activate the shield. Also in the cellphone the moment that u hand the shield equipped should appear button for use it. The third point is that on console you could configure which one button you can use the Shield while still being able to place blocks (if configured with the same Use/Place button), that the latter also works that way on PC.