A simple resolution changer that uses ADB. You need a PC for the first step.
Resolution Changer is a utility tool that leverages ADB and the hidden Android IWindowManager API to modify device display settings. While Google restricted access to this API from Android Pie onwards, Resolution Changer circumvents this limitation by tweaking Secure Settings to disable the API blacklist. The app allows users to customize both screen resolution and display density - if no specific height/width is provided, it maintains the current device resolution, and for unspecified density, it calculates an optimal value based on screen size. Initial setup requires PC connection, and in case of display issues from incorrect settings, users can reset to default values using simple ADB shell commands. This makes Resolution Changer a powerful yet user-friendly tool for Android display customization.