There was a bug where the current DPI was used for generating the font at the selected size, this obviously caused the font to be incorrect. This was fixed a fair while ago, and as far as I know it should be in the Desktop beta version.
I'm on the latest version too, and I'm getting issues with aliasing - it still looks awful - even on the texture group manager
See anti-aliasing on:
Yuck.
And anti-aliasing off - looks better, but not smooth
All font settings are visible, it looks yuck and enabling texture interpolation does not help either.
As for how the font should appear - exactly the same as it appears in the GMS2 IDE. It appears fine in the "Sample Text" preview, but nasty everywhere else
EDIT: Also - I'm not sure, but - isn't there supposed to be a little padding above and to the left of the characters too? Maybe that's just he texture preview though. I noticed some other users point out that the letters were too high up (compared to GM:S), maybe this is a problem?