When a character is moving (no matter which direction it is walking, gliding, sneaking, sprinting, or flying), you can only use the mouse to move the view, not the trackpad (even if the mouse is unplugged), but you can use the trackpad to move the camera when the character is stationary.
(This text is translated from Chinese (Simplified) using Microsoft Translator, and it may not read so smoothly, please understand)
Comments 3
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However, this issue is Invalid.
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This is probably a problem with your laptop not being able to handle multiple inputs at the same time.
Often, laptop input drivers will disable certain types of input (typically mouse movements and clicks) while the keyboard is being used, to avoid problems while you are typing. In this case, you'll need to configure your input devices (mouse device) to disable this feature.
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Being unable to look around with the mousepad, while moving with keyboard controls is likely an issue with your mouse settings on your computer.
(If a mod is lurking, MC-275053 and MC-275052 are the same issue and could be condensed into one report.)