Wanna try another launcher but whenever I switch to the other one it automatically switches back to the system launcher. Why and can this be fixed?

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I bought a Xiaomi device for the first time and it turns into a terrible experience for me, like the lag when I don’t shoot 4K 60FPS video, for example, the warranty is not over yet, is there any way ...

Xiaomi 15 Ultra meets different colored tulips at the annual outdoor festival near my city. My favorite shot of the day is that first one. No edits, all straight from the camera.

Captured with 15U and edited in gallery app.