Click the Windows 10 icon under the Windows search bar, select Settings .
Next, at the Settings interface, we will select the Update & Security item .
Here, click the Recovery item . If you can downgrade your computer, you will see the option Go back to Windows 7 or Go back to Windows 8.1 .
These two options will appear depending on which operating system you used earlier. Next, click Get Started and follow the instructions.
The process of downgrade is fast or slow depending on the computer configuration. But looking at them is faster than upgrading.
When you downgrade to Windows 7 or 8, you need to change your Windows 7 password and don't use Windows 10 passwords anymore, if you have created a Microsoft account for the new operating system.
Refer to the following articles:
I wish you all success!