Any update on this? Right now the left sidebar is a tremendous waste of space.
If you elect to use the unified inbox it’s totally useless most of the time. In this case I would want an option to hide it completely.
When you aren’t using unified inbox and need to access this sidebar frequently to switch between mailboxes it’s nice to be able to simply make this pane very narrow. The user should be able to resize this pane to an arbitrarily small width, and Mailspring should eliminate all the padding on the left side as they do this, so that only the mailbox names are visible.
I’m just evaluating Mailspring right now after switching from Mail.app and these visual clutter issues are by far the biggest issues for me. Mail.app gives you lots of ways to reduce the amount of information on the screen, and if you have a pared-down Mail.app UI the amount of clutter in Mailspring hits you in the face. It would be extremely valuable to me to reduce the amount of visual clutter. (And perhaps it should be the default!)