This article explains where to find Legacy BOOT mode in device BIOS settings
Newer Elo touchcomputers with Windows 10 no longer offers the legacy BOOT mode but rather has a UEFI BIOS. Legacy boot is going away on most modern computers
Some older Elo touchcomputers do have a legacy BOOT mode in the BIOS, this is usually found under Advanced / CSM Configuration / Boot option filter
Please report any broken links by emailing support@elotouch.com and include a link to the knowledge article