Comment # 2 on bug 1123228 from Terje J. Hanssen

Yes, from the first menu that comes up after booting the USB stick (with DVD
iso)  

Boot from harddisk, Installation, Upgrade, More ...

And after selecting "Installation" and then keying ESC, also the scrolling
console boot messages have too small located at 1/5 of the screen width (5 cm
length) at the left edge of the 13" HiDPI display.

When the graphical installer with license screen appear first, the font size is
acceptable and better readable.

(And after installation, the Grub menu also has too small and difficult
readable fonts, though this is another bug)