If you want to change the volume for your Google Home, you may not know actually there are 3 different methods to change Google Home volume: use the touch panel, use your voice, and use the Google Home app.
The result is identical, regardless of the method you choose.
In addition to adjusting Google Home volume, this guide also shows you 4 methods to silence Google Home and how to resume the media playing.
Please note, the 3 methods introduced in this guide apply to media sound and Google assistant. If you want to adjust the volume for alarms and timers, you have to use the Google Home app, as explained in this guide.
If you paired two Google Home speakers and are using the speaker pair, the volume settings will be applied to both speakers automatically.