Secure Boot is a security feature that helps ensure that your PC boots using only firmware that is trusted by the PC manufacturer.
To disable Secure Boot on a Windows 10 PC, you'll need to access the Secure Boot settings in the BIOS menu. The exact steps for this will vary depending on your specific PC model and BIOS version. Once you're in the BIOS menu, look for a Secure Boot setting and disable it. Save your changes and exit the BIOS menu. Your PC should now boot without Secure Boot enabled.