Windows 10 - Reset a Windows 10 device

Back up any info that you want to save.

Select Start > Settings > Update & Security > Backup > Add a drive, and then choose an external drive.
- Backup the info needed.

Select Start > Settings > Update and security > Recovery.

Under Reset this PC, select Get started, and then follow the instructions on the screen.

NOTE: Resetting the device removes the files, settings, and apps, then re-installs Windows.

References

https://support.microsoft.com/en-us/account-billing/before-you-sell-or-gift-your-windows-10-device-or-xbox-one-78ee8071-c8ab-40c4-1d89-f708582062e4