You're looking for an article on GravityBox for Android 13, and specifically, a free solution. Here's some information:
As Android 13 is a relatively new release, support for GravityBox on this version is still evolving. However, there are some developments and workarounds that might interest you.
GravityBox is a popular, feature-rich, and highly customizable Android customization tool. It allows users to tweak and modify various aspects of their Android device, such as the status bar, navigation bar, lock screen, and more.