Darker will permit you to switch system or application themes (dark/light) with a single click.

Having a tray app such as Darker eliminates the need to continuously go to the system settings page every time you want to change themes. All you need to do is click on the Darker icon in the systray to jump back and forth between dark/light themes. A right-click on the icon allows you to configure the settings like choosing between applying it to system and app, app only, and system only. You can also select to have Darker run at startup if desired.

Darker is a simple little app that imperfect for those who want to be able to change up the appearance of their Windows 10 machine without a bunch of extra clicks. Want to have it wherever you go? It does have a portable option as well.

Darker requires .NET Core Desktop to function, which you can get here.

Darker Features:

One-click theme changing

Theme changing options: Both (system + apps), Apps only or System only

Reset to default button (applies Light theme to everything)

Available in English, Russian, French and Ukrainian languages

Auto-update

Similar:

How to Enable Dark Mode for All Sites in Microsoft Edge

Windows 10 Auto-Night-Mode Allows Light, Dark Theme Auto-Switching