Since modern apps often require Android 5.0+, you must look for older versions (legacy APKs) specifically compatible with KitKat:
Android 4.4.2, released in early 2014, was a transitional period for mobile UX. While Google introduced the "Immersive Mode" to hide status and navigation bars, many budget and mid-range devices lacked on-screen controls entirely. When the physical "Home" or "Back" keys fail on these aging units, the device becomes effectively bricked. Navigation bar APKs serve as a critical accessibility tool by overlaying virtual controls atop the existing UI. navigation bar apk for android 4.4.2
You can change the order, color, and size of the buttons. Since modern apps often require Android 5
Developing or installing a navigation bar for Android 4.4.2 involves specific permissions that differ from modern Android 10+ versions: released in early 2014