Hi, why isn’t there a 4026/4033 IC in the library? I guess it has its reasons, but I’m curious. Thank you.
Probably because no one has ever used them since the 4511 was introduced (back in the 1970s).
Although both the 4026 and 4033 had 7 segment decoders, they couldn’t supply enough power for late 70s LED displays, nor did they have storage for displaying, unlike the 4511, so no multiplexing, unless you tried with the counters (really messy).
To build a display back then you needed a 4026/4033, plus a storage chip plus a display driver, (3 chips), or a divide by 10 counter with a BCD output plus a 4511 (1½ chips).
Oh the memories! 
But if you have those chips to design with you could do worse than copy the rectangular symbols on the datasheet. Consider it practice in making your own symbols.
And if you feel pubic spirited you could tidy them to KLC, contribute them to the library project, and become rich and famous. Well actually neither. 
To add to @retiredfeline 's comment; I was going to write: all you need is to start with the 4511 and produce a similar layout, the 7 segments on the RHS, power top & bottom, and most of the other pins on the LHS, BUT, there is no 4511 in the library either. 
So, if you wish to become more rich and famous, make a 4511 symbol as a well as a 4026 & 4033.
And now I have noticed there is a 4xxx_IEEE library which contains a 4511, so unfortunately, the level of richness and public spirited reward suggested by the old cat is about your limit.
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