Customize the collapsed sidebar
There is an ability to customize the sidebar, however it is not consistent when it is collapsed (narrow side-bar).

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Marek Stepan commented
It is also impossible to change the shown folders or even to reorder them. It seems like the function is there, but is not working. Only in not collapsed version. Thanks!!
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Matthias Buhl commented
Would be really great if this could be fixed. The collapsed (narrow side-bar) is much cleaner and it feels more airy...since the app is called airmail it seems to bee a matching feature :-)
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josh sylvester commented
It would be great to add to the icons used in the collapsed sidebar - for example, i'd love to add a link to my Exchange mailboxes in the sidebar, or even better - add a colored circle for each mailbox (with message counts, of course)