The middle text is not taken into account when scaling. This was not the case in previous public versions 

Hmmmm, that's not good. That is likely something that broke by moving to a newer version of Godot. Thanks for reporting, I will take a look

Alright, what I think has happened is that the button to always hide the sidebars is no longer appearing (as I can find no change in the center text behaviors, it has always overflowed when squished too much as far as I can tell). I have fixed the disappearing Always Hide Sidebar button and uploaded a fix. Let me know if this works for you