Always display UEFI boot menu

Hello,

I have configured several EFI boot entries for my Precision 3620 and set a timeout of 10 seconds before automatic boot of the default entry using Ubuntu's efibootmgr.

I am able to see the boot entries and select one of them at startup by pressing the F12 key.

However I would like to avoid having to press F12 each time and my Precision to always offer me the boot menu.

I dug into the BIOS setup utility (firmware is the latest, 2.10.2) but did not find the corresponding option to do so.

How does one configure this ?