`sudo nano /etc/default/grub` use the arrow keys to go to the bottom of the file add `GRUB_ENABLE_BL

sudo nano /etc/default/grub
use the arrow keys to go to the bottom of the file
add GRUB_ENABLE_BLSCFG=true to the bottom
press CTRL+X and then Y, then ENTER to save the file

then write sudo grub2-mkconfig -o /etc/grub2-efi.cfg into the terminal and it should remove the duplicate entries
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