Select the Color black in the options Document background y Application Background.
Open some program LibreOffice, such as the Writer word processor.
In addition, you will not only get a semi-dark mode like that of certain themes, but a full dark mode. But if you don't have a distro with this mode, or you want to simply put the dark mode in LibreOffice, without affecting the rest of the programs, then in this tutorial you will see how you can do that. Some Linux distros, such as Ubuntu, come with a dark mode, which makes things much easier and by activating this mode at a general level, the apps that support it will automatically switch to that dark aspect. In addition, now you can also select a dark mode for those who like those darker tones better, either for simple aesthetics or to reduce visual stress if you spend long periods of time in front of the screen working with this suite. It is showing a greater degree of maturity and functionality for productivity environments. The free multiplatform office suite, LibreOffice, has come a long way in recent times.