Can't navigate sidebar without using mouse
The GNOME 3.26 sidebar redesign has made it nearly impossible (as far as I can tell) to navigate the Settings app with the keyboard only.
This is an accessibility regression particularly for people who can't easily use a mouse.
Test 1
From a settings panel, use only the keyboard to focus the sidebar.
If you press the Left key, you can hear Region & Language but it's not possible to navigate up and down the sidebar list if you started from one of the panels and only use the keyboard.
Other Info
Originally reported at https://bugs.debian.org/913978