Hi Glen! ^_^
So you are in trouble coz you are not able to choose secondary USB camera to function as primary one... Don't worry , I got you covered :)
Just follow given steps! :D
Method 1: If the Webcam is listed under Devices and printers, please follow the steps.
a. Press Windows key + X.
b. Select Control Panel.
c. Click on Devices and Printers.
d. Check if the Logitech webcam is listed.
e. Right click on (Brand Name) webcam.
f. Click on Set this device as default.
Follow method 2 if webcam is not listed.
Method 2: What best we can do is we can disable the Internal webcam. You will be able to enable the webcam anytime you want.
Please follow the steps to disable HP Envy Webcam.
a. Press Windows + X, click Device Manager.
b. Click Imaging devices.
c. Right click on webcam.
d. Click Disable
If this was helpful please click on "YES it solved my problem", it really motivates me towards helping more and more...
Have further question or doubts? Please feel free to ask! Waiting for your reply! :D