Never got the hang of winding it in and out on the move! It’s a get off and faff job,
I’ve had good results by reaching down and turning the little handle thing on the fork either in or out – if you wind it anti-clockwise the fork extends, if it’s not already fully out and if you turn it clockwise, the fork compresses. It’s not immediately obvious that that’s how it works of course, which I think is why RS have gone over to the simpler two-step system on their newer forks.
And for almost the first time ever, I agree with Northwind, I like to have the option of graduated travel adjust. If you’re having trouble turning the U-turn adjuster you are either extremely weak or it needs the knob thing popped off, cleaned and lubed.