While there seems to be a way to activate night mode for some apps on Windows, I find it time-consuming and the theme – boring and not full
What you can do is download Iris. This software has a smart inversion mode (a couple, if I have to be accurate) that will let you have a night mode on everything, not just the apps.
This not only looks cool but is good for your eyes
You can take great advantage of Irisβ main function, which is protecting your eyes from the Blue Light and constant PWM Flicker of your monitor
More about Night Mode here:
Color inversion – Iris – Software for Eye protection, Health and Productivity