How to Change the Speaker
Navigate to the Settings tab, then click on 'Preferences'. Next, click on 'Devices'. You'll find two sections: one for headsets and another for non-headset mode. To adjust the 'Speaker' for each mode, click on the corresponding dropdown and select your preferred option.
In Call
During a call, you can set the speaker by clicking on the Settings icon located at the bottom right corner of the buttons. This will open a dialog with sections for both headset and non-headset modes. Click on the dropdown next to 'Speaker' in the section you want to adjust, and select your preferred option.