I often work in Agenda with the left sidebar, or both, closed, to allow me to have another app I’m refering to open on the screen.
It would be helpful if the history arrows were visible with the sidebars closed, perhaps at the top of the window, next to the link to Agenda Community.
Edited to add:
The actual use case that broguht this up for me, was composing an email on one half of the screen while needing to refer to several Agenda notes on the other half.
Being able to swipe to navigate back and forward would be very useful too.