Setting Path:
realme UI 7.0 & 6.0: Camera app > Video > Tap the image quality switch button at the top (usually 1080P or 4K) to select the video resolution and frame rate
realme UI 3.0 & 4.0 & 5.0 : Camera app > Video >
three dots on the top right > Frame rate
realme UI 2.0 & 1.0: Camera app > Video > Settings > Video resolution
realme UI R & Go & T & S & U Edition: Camera app > Video > Settings > Video size
Note: Not all models support adjusting the video frame rate. Please refer to the actual phone page.