SSD doesn't show up when changing boot mode from legacy to UEFI

[mirmonkeylibra_top]

I use a Lenovo IdeaPad S145-15IKB and recently, I downloaded Valorant and encountered an error stating that secure boot needed to be enabled for this version. I searched for a solution on YouTube, and learned that I should change the boot mode from Legacy Mode to UEFI MODE. So, I made the switch in my BIOS settings and the secure boot option appeared.
But then I encountered a major problem: in the boot section, the SSD option was missing in the Windows Boot Manager section. My Windows 11 was installed on the SSD, but only my old default HDD was visible, which is used for storing important data
The SSD only appeared when the boot mode was set to Legacy.
I want to run Windows 11 in UEFI MODE without any errors or corruption.
My SSD is of MBR type, and my HDD is of GUID type.

 

[Grizzly]

You have answered your own question already.

My SSD is of MBR type, and my HDD is of GUID type.

There is your problem. In order to boot from your SSD in UEFI mode, the drive has to be the GPT mode (GUID), otherwise it will not be recognized.