How can you make letter spacing adapt to the screen size, instead of keeping a fixed spacing? (Widget/UMG)

But this is only in the editor, right? Is this a problem?

Scrolling in and out on a widget is not an accurate way to test how it scales. You are better off dragging it out/in from the bottom right as it actually changes the simulated resolution. Or you can press play and scale the viewport. Does it still act weird then? I’m on my phone so can’t test yet.