If you select the SSD from an F12 does it boot normally from the SSD? Do you still have Windows on the HDD? Have you turned off Secureboot in the BIOS. In the BIOS make sure that Windows Boot Manager is the primary boot source.

Read the posts on the following link especially about cloning and booting. In a nutshell if you clone and before you reboot the system, you have to disconnect the hard drive or the system will boot from it every time. With a clean install no problem but you have to disconnect the HDD before doing a clean install.

https://www.dell.com/community/Inspiron/Clone-only-OS-partition-to-SSD-Install-windows-10-on-new-SSD/m-p/6188720#M36307

Hi. Yes , it boots normally from F12. I don t have Windows on the HDD anymore , I didn´t think having 2 OS was a good idea. The secureboot is still on but I'll try to turn it off. The thing is , there is the windows boot manager in the BIOS but seems it goes everytime to the hdd. Maybe because the windows partitions there? It doesn t detect a different boot option for ssd. I didn't really know very much about cloning but after I did it , I didn't disconnect the HDD , do you thing that would be the problem? I disconnected it later though and it went automatically to the SSD but It took a while , seemed like looking for other things before reaching it. Thank you for your answer