If you regularly join video calls via your browser, but have multiple web cameras attached to your computer (e.g. laptop’s built-in camera and an external camera), you can choose which one websites use by default.

To review and update camera settings:

1. Paste chrome://settings/content/camera to the Address Field and press Enter. (Yes, it’s supposed to say chrome.)
2. Click on the currently used camera’s name to see and select other available options.