Live view screen magnification on K-3

Going on an all-night shot in that London tonight - as it's raining the suicidal K-3 is joining me rather than the Nikons

Never used the Live view on the K-3 before and trying to work out how the magnify the image on screen; of course the image preview dial (the thumb dial) changes the aperture in bulb...so how would I go about it?

I have RTFM but it's useless....

For the K3 II, the OK button activates the magnifier. The rear E dial changes the magnification. K3 might differ.
I do wish they'd stop changing button functions with each new model!

Thanks David - it is the same on the K-3. It's an often asked question I found and the answer was found on another forum...

Works rather well.