Why are the icons in the Settings APP of the Redmi A5 not pretty?

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If the icons in the Settings APP of the phone are not pretty, please refer to the following details:
1. The icons in the Settings APP appear plain or less visually appealing compared to that in the Xiaomi HyperOS. This is because the APP adheres to the stock Android design, which follows the aesthetic and functional guidelines set by the native Android operating system;
2. While the appearance seems simple or minimalistic, it does not affect the overall usability or functionality of the device;
3. In fact, using stock Android helps optimize system resources by reducing memory usage, which in turn contributes to a smoother and more efficient performance across the entire phone.