Nice work!

I have a few thoughts:

1. There is enough space to show the full buttons when switching to pages without the slice/send page, but the button is still collapsed until you resize the window:

2. Maybe consider always show current selectd tab (unless no enough space) then hide from left to right (logically treat the current tab as the left-most one when calculating the sizes):

Hi noisy
1- i kept this with purpose. that prevents position change of buttons. it will make harder to switching between Device-Project-MultiDevice when button positions and sizes change. that will make process unpredictable and causes accidental clicks
2- also that will move position of buttons continuously and will make it harder to use. especially with long translations

both issues can be fixed with an immediate tooltip when button compacted. i think icons are easy to learn and easy to discern enough

I see. I personally do mind changing the size constantly though I do see your point. Let's leave it as is then.