On my Macbook Pro I have my headphones plugged in but the sound (from a videoconference for example) goes to the loudspeakers. This does not happen when I do the same on Chrome. How can this issue be reproduced?
No problem … it’s just names that are different - my Linux system uses Plasma desktop and it operates exactly like a Mac does … here’s a partial screenshot of my panel at the top of the screen
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And the screenshot below is the right side of my panel at the top of the screen … notice my mouse pointer is pointing to the “volume widget” (icon looks like a speaker) … I have clicked on that widget and the “Audio Volume” popup is now visible. You will have a similar icon (widget) on your panel.