Windows let me choose OS only after rebooting

Hi guys, I just used EasyBCD to add Ubuntu in the windows boot manager, now it asks which OS i want to boot in. The problem is that it only asks me it after rebooting from Windows.
So if the computer is turned off when i turn it on it boot into windows then in order to switch to Ubuntu i have to reboot and then select Ubuntu.
Why the windows boot manager does not show up normally when i turn on the computer?
 
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