Mojave Dark Mode includes a new full Dark Mode. If this modes is to black for you, there is a possibility to reverse to the macOS High Sierra dark mode. The following procedure disables the full Mojave dark mode and only enables a dark menubar and dock just like macOS High Sierra.
Terminal
OS X Terminal: Activate focus follow
By default, mouse focus for Terminal is determined by clicking on the desired window, but it is often more convenient to have the focus automatically follow the mouse to any Terminal window.