Currently, I found that I couldn’t view what is written in the Details fields or see any Journal Entries for a character sheet that has them when viewing said sheet from a shared link.
I am on mobile and I opened up a link in browser of one of my own character sheets in incognito mode to check what others would see. When viewing the character sheet in this way, or while logged out of Demiplane, I can choose the Detail and Journal tabs but none of the information therein is available to view until I sign in.