Hi MichaelRyavin,
In my research, it seems that no such settings.
In my test, you can set App Volume in Windows “Settings” >> “Sound” >> “Other sound options” >> “App volume and device preferences” or “Audio Device Settings” in Skype for
Business Client.

For more details, please refer to:
https://support.office.com/en-us/article/set-audio-device-options-in-skype-for-business-2533d929-9814-4349-8ae4-fca29246e2ff
Best Regards,
Sharon Zhao
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