Cryptpad has a rather nice UI, but one inconsistency struck me when I started using it:
In the settings, the public key and user name is in the "Account" section (see location 2), and there is no "Share" button for the public key (see location 1):
While in the user menu, you can find the same info in the "Profile" section (see location 1) and there is a "Share" button (see location 2) next to the public key:
