We upgraded our project from 4.23.1 where we used Calibri as our main font. Unfortunately current version of Unreal does something strange to it which makes it unusable - it breaks its kerning, and it looks like it depends on screen size. For comparison, I put one Text widget above with Trebuchet, and one below with Roboto. Their kerning remains correct at all zoom levels, while Calibri (the middle one) gets stretched or crammed:
This obviously didn’t happen in 4.23.1 otherwise we wouldn’t have used the font.
The same thing happens in playmode on our widgets, where going fullscreen has an effect similar to zooming in in the widget editor.