On the 'Features & Traits' page, 'Class Features' has proficiencies listed; so does 'Racial Traits'. So why does the 'Description' page not list the proficiencies gained with your background?

Also why doesn't Thieves' Cant come up as a language in the 'Proficiencies & Languages' box? I've added it manually but I'm thinking it should come up automatically for rogues.

Quote from 1_tone_deaf_harpy_bard >>

On the 'Features & Traits' page, 'Class Features' has proficiencies listed; so does 'Racial Traits'. So why does the 'Description' page not list the proficiencies gained with your background?

Also why doesn't Thieves' Cant come up as a language in the 'Proficiencies & Languages' box? I've added it manually but I'm thinking it should come up automatically for rogues.

 
For Thieves' Cant its probably because it's technically not a language, it's a code. I do agree this is not much of a distinction and should be shown there. 

Ah, I found the background proficiency list on the description page. You have to click on the background & it comes up in a pop up window. I guess someone different programmed that.

It might be more consistent if all the pages listed the proficiencies the same way for ease of use.