Hi,
It sounds to me like your Windows 10 is not getting installed to the SSD as UEFI...
The boot manager you mention is not the boot device for a uefi machine...
It simply selects a one time boot device... You do want to select your Flash Drive as a "UEFI USB Device" though... Not just a "USB Device"...
Your Boot Device to boot the machine from the SSD will be "WindowsBootManager"...
You will not even select a specific drive... The boot files will be located on a small 100MB "EFI" partition on the SSD...
It is possible that your Installation media was not created properly to install as UEFI...
That can happen sometimes... Especially if created on a different machine..
You might try downloading a ISO instead of creating a flash drive with the Create Media Tool, and then burn the ISO to the flash drive with a free tool called RUFUS...
It must be specifically created for "GPT" and UEFI Bios, as well as being FAT32 file format..
If any of these are not correct, it can be a problem..
Here is what your RUFUS screen should look like... The USB drive and Image name will be different, but the settings are what you need...
BTW... Be sure to delete everything on the SSD and select the unallocated space as Windows 10 will need to create 4 partitions... You could create a data partition on the end of the SSD, but leave the OS partition unallocated...
If your flash drive is detected properly as a UEFI Installation, your SSD should be properly "Initialized" as a "GPT" type drive, and the needed partitions created automatically...
You should not need to mess with any of your Bios settings if your machine is already set up for UEFI Bios...
