See this:There does not appear to be an option in grub2 to boot eg from entry 2 rather then the first entry. (I know of course one can go down the entries with the mouse; I'm talking about an option to make entry 2 the default.)
https://fedoraproject.org/wiki/Grub2
there is excelent explanation to your (and my too) question
--- quote ---
Setting default entry
Due to grub2-mkconfig (and os-prober) we cannot predict the order of the entries in /boot/grub2/grub.cfg, so we set the default by name/title instead. To do this, we set two things: First, we set
GRUB_DEFAULT=savedin /etc/default/grub. Second, we call
grub2-set-default <title or number>with the title of the newly installed Fedora's entry. From that point on you can change the default by calling
grub2-set-default <title or number>or view it by running
grub2-editenv list--- quote ---
It works I can approve it ;-)
Pavel
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