Set a Default Speaker and Microphone in Webex

Choose your User Icon at the top left of the Webex Window

Then select Settings

Choose the Audio tab

There you can select (and test) your Speakers and Microphone that you will want to use with Webex

When you have the correct speakers/microphone chosen, choose Save

Adjust your Speaker and Microphone during a call

To adjust your Speaker and Microphone during a call

Ensure that your call window is Maximized by clicking in the middle of the minimized window

In the maximized window, select the up arrow next to the microphone icon

There you can select your Speakers and Microphone that you will want to use during the Webex call