The Windows Security button is introduced in tablets for easy access to the login screen.
it’s possible for you to also use it on desktops.
This post fromMiniTooltells you how to enable and use the Windows Security button on a tablet/desktop.

What Is Windows Security Button
What is the Windows Security button?
Just like your phones fingerprint scanner the Windows security button works too.
It is used to unlock and access all features of the gadget.

It can protect your privacy since no one can dive into the data stored in the rig except you.
Then, you’re free to type your username and password to enter to your system.
Where Is Windows Security Button
Where is the Windows Security button on Windows tablets/desktops/laptops?
Besides, you oughta notice that not all Windows tablets have a Windows Security button.
To pull up the Windows Security button feature, you should probably press theCtrl+Alt+Deletekeys together.
Step 5: Double-click it, and choose theDisabledoption.
ClickApply > OK.
Way 2: Via User Accounts
Step 2: Typenetplwizand pressEnter.
Step 3: Go to theAdvancedtab and check theRequire users to press Ctrl+Alt+Deletebox.
Final Words
What is the Windows Security button?
How to enable and use it on a tablet or desktop?
Now, you should find the answers on the above content.