How to see if the system is UEFI or Legacy BIOS boot mode

Press Win+R to open Run, type msinfo32 and enter to view system information. In the BIOS mode if it shows "Legacy", it means that the system boot mode is Legacy BIOS; if it is UEFI, it shows UEFI, if yours doesn't show up you can look at the next method

Method 2:

When booting up the computer, the manufacturer's logo will come out first, and then If your computer doesn't show the logo, you can see the next method

Method 2:

When you turn on your computer, the manufacturer's logo comes out first, and then a black screen comes out, and then a small circle comes out and turns under the blue windows logo, which is legacy.

The manufacturer's logo comes out, and then a small circle comes out and turns under the manufacturer's logo, which is uefi.

The manufacturer's logo comes out first, and then a small circle comes out and turns under the manufacturer's logo, which is uefi. Just look at the next approach.