You can also press the keyboard shortcut Windows Key + A for the Action Center and not use the mouse click. How to add brightness slider in Notification Center Here’s how to add brightness slider in Notification Center on your Windows 10 PC.
Tablets offer a slider to control the brightness from within the screen, but for a laptop, you may not find this slider by default in the Notification Center or Action Center. This button can be really handy if you want to manually adjust the brightness. Most laptops come with a dedicated brightness function that lets you control the brightness with a push of a button, unlike tablets.
