Screen timeout on Yaelink t46s

[Chichi]

Hi,

I have a Yaelink T46S and would like to screen to always remain on so I can see the screen and who is on the phones with the BLF.

I have logged into the phone UI and set the screen saver to 6 hours however the screen still dims and the screen saver is seen.

Anyone know what else I can do ?

Thanks,

Scott