iPhone screen is turned off while TikTok videos are playing if i do not touch the screen for some time

since i bought my new i phone 15 pro max , my phone screen is turned off while tiktok videos are playing if i do not touch the screen for some time.

this was not the case in old i phone.

is there any setting that i need to change so that my phone display is not turned off while some videos are playing in tiktok or youtube

thanx

anagha

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