Boot Option for HDD Missing After Adding SSD and Installing Windows

Problems on boot option after installing Windows 10 on SSD (confuse situation, multiple questions)

I’ve bought a new Lenovo 330 laptop with Windows 10 and a SSD.

I wanted to move Windows 10 to the SSD.

I’ve created an installation media and installed Windows 10 on the SSD.

After I installed it, the next time i booted the laptop, there was a screen asking me to choose which windows I wanted to use. There were two options. They vanished too fast I couldn’t read it.

After this first time, this screen didn’t appear anymore.

Now I have Windows 10 installed no both HDD and SSD. But they are not equal. In Computer Management > Disk management The HDD has 3 partitions: EFI System Partition, Primary Partition “Windows D:” and OEM Partition (“WINRE_DRV”). While the SSD has a single
partition C: which reads “Boot, Page File, Crash dump, Primary partition”)

In the BIOS/UEFI there are 3 boot options, organized in two lists:

-The EFI list, which only contains the boot frmo the HDD

-The legacy boot list, which contains the HDD (the same HDD from the EFI list) and the SSD option.

All three options boot the same Windows 10 – the one installed in the SSD.
I saw that creating a blank file in th Desktop in the SSD and loading all three options (tell me if this method doesn’t make sense).

-If legacy boot options are enabled, its not possible for the Secure Boot option to be enabled.

My questions:

1-Why are the UEFI HDD boot option and the legacy HDD boot option loading the SSD windows? They are just wrongly labeled (being, in truth, the bootloader from SSD) or they re really written on the HDD but loading the SSD?

2-Because of question 1, I don’t know if I can format the HDD, because if those boot options are really from the HDD ( and not from the SSD) I might completely loose my UEFI boot. Is that correct?

3-I expected that when installing windows 10 on the SSD it would install a UEFI boot (if I remember correctly, I even that to change the partition of the SSD frmo MBR to GPT because of this), not a legacy boot, as it apparently did. How can I fix that?