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 2.0.7.54 and HS firmware 1.0.0.265
Thanks!

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.