The largest size is 1296--- just put your cursor in the size box and type it in.
Font sizes are based upon the printing world- 72 vertical points to an inch. When computer screens came about from the big 2 (windows and mac) they wanted their screens to represent a full sized printed page viewed from about 2 feet- which is where the 72/96ppi thing comes from. If you measured a 72pt font on one of those old monitors, using a simple school ruler, it would in fact be 1" tall.
A 36 pt font would be 1/2" tall. a 18pt font= 1/4" tall.
Modern screen are sharper than that-On my monitor a 72pt font is actually a tad over 3/4 of an inch--- today, font sizes are relative.
Your computer is a mini computer, nothing wrong with that.
I would buy a bigger montior- mine is a 32"- and it's nice.