Sidebar not available in narrow window

Hello,

Here’s a thing that I’ve noticed while working with two narrow windows of separated files. When it comes to make a narrow window and Font Info and Sidebar buttons disappear there’s no option to make any of them appear. As you can see in the screenshot, both appear if I click on the double arrow but are not working if I want to show/hide each option. I guess this is something that should be working, right?

Thanks!