Google is rolling out an update to its YouTube app on Android that will give users a way to control their playback experience. The feature will let you filter content by the channels you’re subscribed to. This means that when you tap on a channel, you’ll only see videos from that specific channel.
YouTube Sort Subscriptions | Manage YouTube Subscriptions | Organize YouTube Subscriptions
The videos displayed when selecting a channel are displayed in reverse chronological order. You can switch directly from the current channel to the channel you want to watch, and the app also provides a way to open the channel's homepage.
BTW, you can also disable a channel’s videos via suggestions on YouTube’s homepage if you want, while here’s a trick on how to watch YouTube in the background so that you can use another app while the video is still playing. If the YouTube app isn’t playing in a pop-up window for you, there’s a workaround for that.
The following guide will help you find videos from a specific channel you are subscribed to.