We purposedly made the toolbar simpler in Findings 2, though I could see how there could be an option to have the items for paragraph formatting be optionally shown instead of a popup menu.
Now, the actual bug is that the keyboard shortcut for ‘Fixed Width’. It was supposed to be alt-cmd-F, but somehow it’s not registered by the system (even though it’s not used elsewhere, as far as I can tell). I switched it to alt-cmd-X for the next update.
In the meantime, you can go in System Preferences > Keyboard > Shortcuts, and set the keyboard shortcut for the menu item ‘Fixed Width’. Let me know how it goes…
Thanks for your patience and help with reporting this bug!