Except for RAID 1, a computer wasn't design to boot with 2 drives with the same OS.  While you can insist and keeping both drives in your system, you can temporarily select to boot using F12 boot menu, you can swap SATA cable to change the port order in the controller, or you can change boot order in BIOS by deleting windows boot manager and manually set SSD as first boot, these change don't work permanently. A Windows update will make change to your system files and your computer won't boot normal anymore.  There is other concern, a spinning hard drive will fail eventually, so keep you data backup to external source, do not rely solely on the HDD, especially when it's over 5 years old.   To setup your computer properly, you will need to set a permanent process for your system to work the way you want.  While I can assist with sharing my knowledge, providing instructions, it doesn't reflect my choice of settings or how I would want on my own system. There are different ways to change and set your boot order but always keep backup.  Use Macrium to make a backup of your EFI partition (the 100 MB partition) in case you change your mind, or need to boot the HDD later on. It's very simple to edit from BIOS, boot your machine up, tap F2 for BIOS settings and go to UEFI boot order, select to delete the HDD from the list.  Save and restart machine.  It will boot with SSD from now on and HDD is still accessible for data. To edit boot order from Windows, open elevated command prompt, type bcdedit /enum firmware, you'll see a list, type bcdedit delete identifier, select and type the identifier of HDD you want to remove inside brackets { }.  Hit enter, that should remove the EFI partition on the HDD.  Exit and reboot machine.  It will boot with the SSD from now on.
I added an SSD to my Inspiron 3650 and cloned my HDD to it.  I can boot from the SSD just fine but I can’t figure out how to change the boot sequence in UEFI to put the SSD first. Is this procedure documented somewhere?  Thanks in advance.
Inspiron 3650 Boot Sequence