1. First, you will need to Enter into BIOS/UEFI
2. Then use yor arrow keys to navigate to Boot Tab.
3. Under Boot Option Priority, which will list connected SSD, or USB if connected
3. Use the arrow keys on your keyboard to change the order. Now Save and Exit.
Now, when you boot it will follow the sequence in which you have set in your BIOS/UEFI Firmware Settings.
This comes in very handy when you want to boot from a USB drive, which has Windows 10 Installation files or if you have another Windows installed on secondary hard disk.