Starfinder - Theme lists all benefits (6th, 12th, 18th) at low level
Upon attempting to test the updated Starfinder Society files (for the Morlamaw), when I selected the Solar Disciple theme, it shows all four of the theme's abilities on the character sheet tab. The character is 2nd level, so only the first one should be shown.
I haven't tried starting over on character creation to see if this is consistent yet (and probably won't get a chance to tonight or tomorrow), but when I do, I'll update.
Okay, I lied. I created a quick new character and also tested this with the original. When you select themes from the Core Rulebook, all four of the theme abilities are listed on the Feats and Abilities tab, but not the character sheet. But, select one from Pact Worlds (of which Solar Disciple is one), and all four appear on the character sheet tab as well. I tested this with three different themes from the CRB and PW.