App Settings GB APK - Change DPI for each app.
If "App Settings GB APK" is a third-party app that lets you change app-specific options, I can give you an idea of what kinds of features it might have. Please keep in mind that this information might not exactly match the features of the APK you're talking about:
Features:
You can change the display resolution, or DPI, for each app, which gives you more control over how apps look on your device.
Screen Resolutions Made to Order
Change the screen size settings for certain apps to make them look or work better.
Change the size of the font
Change the font size or scaling of text in different apps to make text easier to read or to fit more on the screen.
Fullscreen or Immersive Mode Must Be Used
Enable fullscreen mode for apps that don't support it by default to make the most of the space on your screen.
Lock on Orientation
Set certain apps to always use a certain layout (portrait or landscape), no matter how the device is held.
Changes to Performance
Fine-tune the speed settings for each app, such as CPU usage, graphics rendering, and frame rate, to make them run as well as possible.
Control of the Network and Data
Change the network settings for certain apps, like limiting how much data they can use in the background or setting a custom proxy.
Customized rights
Manage app permissions per app, giving or taking away certain abilities to improve privacy and security.
Save and Get Back
You can save and restore app settings, which makes it easier to switch between different sets.
You can make different setups with different app settings and switch between them. This lets you quickly adjust your device to different uses.
Please keep in mind that these features are based on the general idea of an app that changes the settings of individual apps. They may not exactly match the features of the "App Settings GB APK" that you stated. I suggest looking for public documentation, user reviews, or guides about that APK if you want to find out more about what it can do.