https://support.apple.com/guide/mac-help/adjust-the-volume-mchl1f98810b/mac
Turn your Mac volume up or down
To change the volume on your Mac, click the Volume control in the menu bar, then drag the slider to adjust the volume (or use the Control Strip).
If the Volume control isn’t in the menu bar, choose Apple menu > System Preferences, then click Sound. Click Output, then select the “Show volume in menu bar” checkbox.
https://support.apple.com/en-us/HT203186
Check your sound settings
If you still can't hear sound from the internal speakers after updating your computer's software, check your sound settings…
From the Apple () menu, choose System Preferences.
Select Sound.
Click the Output tab, then select Internal Speakers. If you don’t see Internal Speakers as an option in the Output window, contact Apple Support.
If the volume slider is set low, move the slider to the right and test again.
If the Mute checkbox is selected, deselect it and test again.
If you still don’t hear any sound, contact Apple Support.
