The system navigation on the Xiaomi 14T includes gesture-based controls or navigation buttons, depending on your settings.
To use gesture system navigation on your phone, please refer to the following steps:
1. Go to the [Settings] APP on your phone;
2. Select [Home screen];
3. Tap [System navigation];
4. Select [Gestures];
5. If you turn on [Hide full screen indicator], the full screen indicator will not show when using full screen gestures;
6. If you turn on [Gesture confirmation], gestures will only work after they are repeated in some cases (e.g. when playing games or watching videos);
7. Scroll down to check the gesture demos. In the gesture system navigation, you can swipe up from the bottom of the screen to go to the Home screen, swipe up from the bottom of the screen and pause to open Recents, swipe left or right from the edge of the screen to go back, swipe left or right from the edge of the screen in the top area to trigger APP’s action, or swipe left or right from the full screen indicator or bottom of the screen to switch between APPs.
To use the navigation buttons on your phone, please refer to the following steps:
1. Go to the [Settings] APP on your phone;
2. Select [Home screen];
3. Tap [System navigation];
4. Select [Buttons]. Once selected, there will be three buttons (Back button, Home button and Menu button) at the bottom of the screen;
5. You can turn on [Mirror buttons] to mirror the Back button and Menu button;
6. Tap [Button shortcuts];
7. You can customize the shortcut functions of the buttons;
8. Tap [Automatically disable navigation buttons]. The device will automatically disable navigation buttons when status bar is not displayed. Double tap any navigation button to re-enable;
9. You can set the [Automatically disable navigation buttons] function for specific applications by tapping the APPs;
10. Choose the disable method for the APP.

Does it help?