Chrome Version: 70.0.3538.77 (Official Build) (64-bit)
OS: Mac 10.13.6

What steps will reproduce the problem?
(1) Download some items (e.g., pdf) so the download bar appears.
(2) Enter full-screen mode.

What is the expected result?
(3) The download bar still appears, attached to the bottom of the screen.

What happens instead?
(3) It does not.