This was mentioned in a holistic testing session (late 2019), but I thought i would add it here...
We would like to have the option to group buttons using a Tab or Pages theme. For some field data capture projects we have multiple themes and sometimes too many buttons! It would be good to be able to separate the buttons by theme and improve navigation between these groupings through tabs and/or swiping through pages. Tabs along the top/bottom or down the side would probably be better for ah-hoc navigation (jumping between pages).