This counts for any of the sliders (like volume limit in settings etc.) in the the apps for all platforms and devices. Now only showing the iPad app below:
Best answer by Jeff S
Welcome to the community, and thanks for the suggestion. We're always looking for ways to make the experience better, and many current features come from requests like yours. I'll send in a feature request to make it so you can click and drag the volume sliders from any place on the bar.