The Xiaomi 14 Ultra supports Wi-Fi sharing. Wi-Fi sharing, often referred to as Wi-Fi hotspot or tethering, allows you to share your smartphone's mobile data connection with other devices.
For your reference, here is more information regarding Wi-Fi sharing as below:
The Wi-Fi sharing allows you to still access the Internet through mobile devices in places without a fixed network connection, such as travel, outdoor activities or temporary office space. In scenarios where multiple devices need to share the same network connection, Wi-Fi sharing can provide convenience, such as small group meetings, team collaborations, or multiple family members online simultaneously.