Booting USB into UEFI mode with legacy support in Dell BIOS

===========DELL BIOS==============

In many situation, i have to boot to WinPE in uefi mode with legacy support to repair something

i would like to see the uefi boot line in this picture

but when i create a usb boot with a hiden fat32 partition in my usb, i cant see this line? what wrong with my usb
i have try to setup MBR and PBR by bootice but nothing change

can someone teach me how to create 2 hiden fat32 partition to boot in this case
addition

in legacy mode, i use plop boot manager so i can choose with partition to boot but in uefi i cant do this

i want my laptop can automatically recognize my fat32 partition

thanks