How to change resolution on PiMax 4K

How can i change setting for higher resolution than 1920 x 1080 (heard it can go as much as 2560 x 1440)
Running PiPlay and HS firmware

Settings gear on the right top

It runs by default with 2560x1440 and allows you to decrease the resolution down to full hd with a check box in settings.
Means you have to make clear that the check box isnt activated in order to run full resolution.

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What do you mean by setting gear on the right top ?

Look at Piplay screen top Right there is a gear. Click on it to adjust settings.