I was just looking for these, too, and it looks like you can find these on the Character Sheet or Character Panels tabs. To see skill proficiencies, you can expand the abilities to look at all of skills that fall within each ability score. For weapon/armor proficiencies, you can see those by expanding the class area. I do think, though, that it would be nice to have a dedicated "Proficiencies" section or an option to automatically keep those areas expanded in the UI so we don't have to expand them every time we're looking at them.
