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Windows Boot Manager should always be first in the boot list.

Are you sure it actually booted from the new SSD when you booted?

You may have two issues here.
1. First is that you imaged the SSD with BIOS set to RAID (don't change it now!).

2. Since the HDD and new SSD have both Windows files on them, you may need to try booting from the HDD via the F12 menu.  Reboot and start tapping F12 when you see the Dell splash screen. When the menu opens, look for the option to boot from the HDD.

Keep in mind the next time you boot, you may have to use the F12 menu again, this time to boot from the new SSD.  So at some point, you'll have to boot from the SSD via F12 and use Disk Management in Windows to initialize the HDD (ALL FILES DELETED!). Once you initialize that drive, PC should automatically boot from the SSD without using the F12 menu and you can use the HDD for routine storage.

NOTE: You may want to image the HDD before you initialize it so all your files are backed up, at least as of the date you make the image. Save the image on an external USB drive. You can use any imaging apps you choose, and there are some very good ones like Macrium Reflect that are free.  Whatever app you use, also use it to create a bootable USB stick that you'll need if you ever want to restore the image back on the drive.

Yes I am positive it is booting from the SSD, it is the C: drive in windows. 256GB, the E: is the 1 TB SATA drive. The problem is after I told the BIOS to boot to UEFI hard drive, it removed the option to boot to the SATA drive. If I disable the SSD drive, it will boot to the SATA, but not see the SSD drive.

There is a way to set up dual boot in UEFI so that you have two storage devices each containing a complete bootable OS.  When set up properly on start up Windows boot manager will prompt you to choose a device to boot from.  Usually if you do not click a choice it will boot from the first device on list.  The grace period waiting for user manual choice is programmable. Default may be a few seconds.  Note this prompt looks different from traditional boot list you would see by pressing F12.  This prompt comes on screen automatically after power up pc without pressing any key because Windows boot manager sees two bootable sectors and wants to ask you gently which one you like before it goes to boot from default.  I have done this before when I had NVMe ssd as single bootable device first then added a sata hdd and did a clean install of Win 10 on it.  Since then pc always prompts the dual boot screen.  Even after I remove the sata hdd, it still prompts although it also sees the second boot device no longer has a sata designation.  Windows boot manager still has a record of two bootable sector even after the sata hdd is disconnected.

If such dual boot option is what you intend to have, you can try to make it happen.  If so, remove hdd, clean install Win10 on ssd via uefi, then connect hdd, do another clean install of Win10 on hdd via uefi.

redxps630,

Whoa, who said anything about reinstalling the OS. I copied the SATA drive to the SSD drive with Casper 10. worked well and once I changed the BIOS to UEFI hard drive the SSD drive is nice and fast. I can use Casper 10 to backup the SSD to SATA. However, the option to boot from the SATA drive is gone with UEFI unless I disable the SSD. The BIOS now says BOOT "from UEFI Only" now. My guess is can't go back to Legacy...

@marcusgi  Did you make Windows Boot Manager first in the boot options list?

Have you tried using the F12 menu to select whichever boot drive you want?

And you may have to start the cloning over after BIOS is set to AHCI, but it has to be changed the correct way:

1. Boot from the HDD, and open Cmd, Run as administrator
2. Copy-paste this command, which will start Windows in Safe Mode the next time you reboot:
   bcdedit /set {current} safeboot minimal and press Enter
3. Restart the computer and enter BIOS setup
4. Change the SATA operation mode from RAID to AHCI
5. Save the change, exit Setup and Windows will automatically boot to Safe Mode.
6. Open Cmd again, as in step #1
7. Copy-paste this command, which will start Windows in Normal Mode the next time you reboot:
   bcdedit /deletevalue {current} safeboot and press Enter
8. Reboot and Windows will automatically start with AHCI drivers enabled

Now clone the HDD onto the SSD all over again...

So the weirdest thing happened. I disabled the SSD drive. Hooked up a second SATA drive and cloned Sata drive 1 to Sata drive 2. removed Sata drive 2. enabled SSD drive, now the BIOS is showing boot from either UEFI hard drive (SSD) or Sata 1, just like I wanted to begin with. must be the Gods looking out.... lol

Glad you figured out a solution yourself.