Request ability to zoom or scale mixer contents

Your idea

Right now the mixer contents are a fixed size. You can add or remove elements from the channel strip, but the strips are always the same basic width. It would be nice to be able to zoom out (or have a setting for scaling) to allow more channel strips to fit in a given width of the panel.

Problem to be solved

In scores with very many instruments, scrolling horizontally to find the instrument you want to adjust can be awkward.

Prior art

The Piano Keyboard panel can already be zoomed via Ctrl+wheel - this would be useful for the Mixer as well.

Additional context

There are other requests that could help with this - see for instance https://github.com/musescore/MuseScore/issues/23662, https://github.com/musescore/MuseScore/issues/12008, and https://github.com/musescore/MuseScore/issues/21577. Also the idea of being able to group channels, which I don't see an open issue for but is presumably on the radar already.

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests