The reason this application requires root is to elevate permissions to run the wm command. This command allows the device to change its own resolution and density. This used to be adjustable in previous Android versions but more recent versions require root access.

To use this app add the three toggles to your Quick Settings menu. Press the Zoom In button to increase your DPI. Press the Zoom Out button to decrease your DPI. Press the Reset DPI button to reset your DPI to the device's stock config.

If for some reason your phone becomes inaccessible due to excessive zoom preferences you can always reset the DPI manually via ADB with these commands:

adb shell
wm density reset

Enjoy the app and email me at [email protected] for support or contact me on telegram @tytydraco.