Signal: what are you using?

if you can get the double-tap-drag to work, you can resize the side panel without a mouse. I was only able to do it once.

If you would like a menu item added to collapse the left side pane, I recommend asking for a feature request, or creating a PR for it. https://github.com/signalapp/Signal-Desktop/issues/new/choose

1 Like

See also here on the Signal forum.