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Hello AlexZheng5 and welcome to the Microsoft Community!
Based on your feedback, you are experiencing Desktop PCs not detecting laptops through the wireless display.
You can try the following:
Ensure that the Windows 11 device supports Miracast. To check this on your computer, press the Windows logo key + K. If the device does not support Miracast, you may see a message stating that
that a cable needs to be connected to force a conversion to an external display.
Ensure that Wi-Fi is turned on. To do this on your computer, select the Network icon on the far right side of the taskbar and check the Wi-Fi Quick Settings.
Make sure the monitor supports Miracast and verify that it is turned on. If the wireless display does not support Miracast, you will need a Miracast adapter (sometimes called a dongle that plugs into the HDMI port).
Ensure that the Wireless Display app is installed on the target computer. Optional feature in the Wireless Display app (currently requires Windows 11). If this device is not discoverable, try typing Wireless Display in the search box on the taskbar and selecting it in the results list. Now, check for this device on the device from which you want to project.
Make sure that the device driver is up to date and that the latest firmware is installed for the wireless display or adapter. See the manufacturer's website for support information for instructions or search for the manufacturer's app in the Microsoft Store for help.
Restart the computer and the wireless monitor.
Delete the wireless monitor, then reconnect it. To delete the device, open Settings and select Bluetooth & Devices > Devices. Under "Wireless Displays & Docking Station", select "More Options (three vertical dots)" next to the wireless display or the adapter you want to remove, then select "Remove Device > Yes Select "Delete Device > Yes". Then try to reconnect.
Ensure that the Windows 11 device supports Miracast. To check on your computer, press the Windows logo key + K. If the device does not support Miracast, you may see a message stating that a cable needs to be connected to force the conversion to Miracast.
that a cable needs to be connected to force a conversion to an external display.
Ensure that Wi-Fi is turned on. To do this on your computer, select the Network icon on the far right side of the taskbar and check the Wi-Fi Quick Settings.
Make sure the monitor supports Miracast and verify that it is turned on. If the wireless display does not support Miracast, you will need a Miracast adapter (sometimes called a dongle that plugs into the HDMI port).
Ensure that the Wireless Display app is installed on the target computer. Optional feature in the Wireless Display app (currently requires Windows 11). If this device is not discoverable, try typing Wireless Display in the search box on the taskbar and selecting it in the results list. Now, check for this device on the device from which you want to project.
Make sure that the device driver is up to date and that the latest firmware is installed for the wireless display or adapter. See the manufacturer's website for support information for instructions or search for the manufacturer's app in the Microsoft Store for help.
Restart the computer and the wireless monitor.
Delete the wireless monitor, then reconnect it. To delete the device, open Settings and select Bluetooth & Devices > Devices. Under "Wireless Displays & Docking Station", select "More Options (three vertical dots)" next to the wireless display or the adapter you want to remove, then select "Remove Device > Yes Select "Delete Device > Yes". After that try to reconnect.
I hope the above information is helpful.
Kirito|Microsoft Community Support Specialist