IPTV Smarters Pro navigation tips and tricks in the app new user

I’m new to the app. I’m able to get it to work ok. I have subtitles turned off in settings, but while watching an NHL game subtitles are on. I can’t figure out how to remove them. They don’t come on on other channels.
I can’t seem to find any user instructions. I’m having trouble stopping a channel to switch to another, among other things
Thanks for any help, Tommy

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