LG 25GB Remote won’t turn on set top box

New TV OLED55C54LA with Remote WebOS25 will not operate my Sky Box. I have been through the setup procedure but cannot find out how to switch on the set top box from the remote.

On my old LG TV 2020 there was a separate button and there isn’t on this remote.

I know it’s hardly a big deal but don’t like going backwards.

Help!!

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