The Finder is your window into macOS. You dip in and out of it throughout the day, every day—moving between folders, finding and opening files. Mojave adds new options both for how the Finder looks and acts.
Designers have long used dark backgrounds to improve their accuracy when working with color and detail. Likewise, some people find that the high contrast between a dark background and white text makes text easier to read. Yosemite let you fade your Mac’s menu bar, menus, and Dock to black. Now Mojave takes this further (Figure 5).