How to switch laser on to focus

Hi to all.
I am new to LaserWeb4. i need to switch on my laser to focus it. my machine is a diy 5.5w. with Andrino uno and cnc shield grbl 1.1f. All works fine but cant switch on laser.
Can some one please help me.
Many thanks.

There is a “Laser Test” button in the control tab to manually switch the laser on/off, but first you need to configure the CHECK-SIZE POWER in settings / gcode, as the default is 0% for security reasons.

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