To connect the monitor to a Windows Surface without losing 5K resolution, you should connect the monitor's USB-C port to the Surface's USB-C port with a USB-C cable that supports DisplayPort video and USB data. The USB-C cable must support DisplayPort Alt mode and ideally be USB 3.1 or higher to ensure full bandwidth for 5K at 60 Hz. A simple USB-C cable without these specifications may result in loss of resolution.

The monitor supports USB-C with DisplayPort video and USB data transfer as well as 96 W Power Delivery, which means that the cable should also be suitable for power supply if desired. Make sure that the cable is explicitly certified for 5K displays or DisplayPort 1.4 to transmit the full UHD+ resolution (5120 x 2880 pixels) at 60 Hz.

If your Surface does not have a native USB-C with DisplayPort Alt mode, an adapter may be necessary, but for 5K, a direct USB-C connection with DisplayPort Alt mode is the best solution. After connecting, you can adjust the projection with Windows key + P.

To summarise:
- Use USB-C cable with DisplayPort Alt mode (at least USB 3.1 Gen 2)
- Cable should support DisplayPort 1.4 for 5K at 60 Hz
- Direct connection to USB-C port of the Surface (no pure USB-A or HDMI adapter)
- Set monitor input to USB-C and configure Windows projection

These requirements ensure a lossless 5K connection between Surface and monitor.