To set the YouTube app to play 360p instead of 240p video, follow these steps:
1. Open the YouTube app on your device.
2. Play the video you want to watch.
3. Tap on the three-dot menu icon in the top-right corner of the video player.
4. Select 'Quality' from the menu.
5. Choose '360p' from the list of available resolutions.
Now, the video should play at 360p quality. Keep in mind that the available resolutions may vary depending on your internet connection and the video itself.