Update the Atto toolbar configuration so that collapse is the first button Load an Atto editor and verify that by default, there are only 2 button groups visible, and clicking on the show/hide advanced buttons button toggles the visibility of the extra groups. Visibility should be toggled for screenreaders also (visibility attribute). The title of the button should change to indicate if it is hiding or showing buttons (Show more buttons / Show less buttons). Show all buttons, then using the keyboard focus on the last button. Click the button to collapse the toolbar, verify the focus moves to the collapse button. Verify you cannot navigate to the hidden buttons with the keyboard.