You can adjust the resolution of the live screen through the app. Please tap the "full screen" icon 
which is located in the right corner to enter the full screen live>
find the "SD/HD(2K)/Auto" button.
- SD (Standard Definition): 720P, doesn't offer the same quality as HD but will use fewer network data (bandwidth) and consume less battery than HD. It applies to not-so-good network conditions.
- HD (High Definition): 1080P, offers higher quality video and a better overall viewing experience.
- 2K(2K Resolution): Only some models would support this instead of HD.
- Auto: SD 720P or HD 1080P/2K, depending on your current network status. If it is good, the live screen will be HD; if it is poor or unstable, SD will be selected automatically.