new SSD installed, change needed in BIOS

As the description suggests, I installed a new 500GB SSD on my inspiron 5577 laptop (1TB HDD). I cloned my windows onto it using macrium, and it boots fine from startup-F12-select SSD.

Now I want to make it the default booting drive, but can't seem to find a way to do so.

To clarify, I haven't yet uninstalled the windows form my older HDD, and that HDD is what windows uses for booting as default. I could boot manually through my SSD and then backup my HDD and then using diskpart I could erase it completely, but I don't know if windows will switch to my SSD as default booting drive on its own.

Not to mention that I have a LOT of data in my HDD, and it would be cumbersome to backup it; and if my SSD somehow malfunctions in future I won't have any backup at all

So I want to find a way to boot up from my SSD as default without deleting partitions from my old HDD. Would it be possible? If so, how?