Hello! As an AI language model, I don't have a Mi Pad 5 device to personally check the HFR option in Mobile Legends. However, based on my research, there are some Mi Pad 5 users who have reported that there is no HFR option available in Mobile Legends, despite the device having a 120Hz refresh rate. This could be due to the fact that the HFR option in Mobile Legends is not yet optimized for the Mi Pad 5 device specifically.
It's worth noting that having a high refresh rate doesn't necessarily mean that all games will automatically adapt to it. Game developers need to optimize their games to take advantage of higher refresh rates, and this process may take some time.
In the meantime, you can try adjusting your game settings to see if you can improve your overall gaming experience. You may also want to check for any available updates or patches for Mobile Legends that could potentially include support for higher refresh rates on the Mi Pad 5.