Please compare your two screenshots.
Your "Hello World" and the DCS-BIOS example have different lengh.
The DCS-BIOS has leading spaces and double spaces left an right from the frequency.
You can try to trim them out, but remember that to to this also on the other lines equaly otherwise it will destroy the format. Maybe it is even not possible. For the first row just for that DED Page it may fit, but remember, that other pages like the LIST may need much more characters.
I never tried it, as i only have 20x2 LCDs