WASD+ Cast's USB feature to cast and control your Android devices, you should enable the USB debugging on your Android device first.
How to Enable USB debugging on VIVO Device?
1. Go to "Settings" on the phone;
2. Scroll down and find "More settings";
3. Go to "About phone";
4. Find "Software version, tap it 7-10 times to make Developer options available;
5. Go back to the previous page and go to "Developer option";
6. Turn on USB debugging and tap "OK" on the pop-up window.