You must have your desktop set up for dualview. Right click on your desktop, choose Properties then the Settings Tab in the Display Properties Window. You should see two boxes numbered 1 & 2. Right click on the #2 box, you will see that Attached is checked, click on it to uncheck it. Click Apply then Ok at the bottom of the Display Properties window. Hope this takes care of the problem!
Asus Zenbook Q508UG-212.R7TBL 2-in-1 Laptop
AMD Ryzen 7 5700U Processor
8gb DDR4 RAM (Soldered on Motherboard)
1gb Western Digital Blue NVMe SSD
NVIDA MX450 (DDR6)
15.6" 1920 x 1080 (Full HD) Touchscreen
Intel(R) Dual Band Wireless - AC 7260
USB 1 x 2.0 - USB 1 x 3.0 - USB-C 1 x 3.1
Micro SD Card Reader
Lighted Keyboard
Webcam/Microphone
Windows 11 Professional
MS Office 365 Family
Logitech Anywhere MX Mouse