Im using Sonos app (v 80.16.33 ie the most recent version iOS released 2 weeks ago as of agent 15, 2025).
When attempting to use the horizontal sliders for Volume Control of speakers individually or as a room, I find it extremely difficult to adjust with my finger the volume in small increments eg (+/-1 increments) - especially attempting to reduce the volume.
I happen to have a surround setup with Sonos arc, and controlling the surround setup’s volume settings in the surround settings → “Surround Volume” for “TV” and “Music”, there are much appreciated “-“ and “+” buttons to the left and the right of the finger slider volume control.
I suggest and kindly request that the Sonos app (at least for iOS) throughout the app adds the “-“ and “+” to the left and right of the end of all all the volume sliders in the app (ie for all speakers playing music) - to make it easier to adjust playing volume in small increments.