Hi,
You will get a hardware error of some type trying to select "Legacy" if your SSD has already been set as a "GPT" drive...
You will also get an error attempting a Legacy installation using UEFI Installation Media...
This stuff is not compatible with each other...
When UEFI machines were introduced, they no longer use a "drive" as a boot device...
They use a "File" on the EFI partition...
As I mentioned about RUFUS... It has options for either UEFI Bios or Legacy.. Although it does not call it "Legacy"...
For Legacy you need to select a "MBR" drive and NTFS file system...
The UEFI uses "GPT" drive and FAT32 file system...
Here is an image of RUFUS for Legacy...

If you have UEFI options in your Bios, then you should be able to use it to install Windows...
I am using a 6-7 year old Asrock motherboard myself... I normally run Legacy Bios, but it switches to UEFI quite easily...
It actually automatically switches the type of bios it uses based on the configuration of the bootable installation media...
BTW... Is this a Samsung SSD running on a AMD motherboard by chance ?