GNU/Linux RHEL Editing Grub Menu Entries GUI Guide
How to Edit Grub Menu Entries Easily with GUI on Red Hat Enterprise based GNU/Linux desktop – Step by step Tutorial.
And this Guide make use of Grub Customizer, a useful UI Tool for changing the Settings of the GRUB boot loader.
Finally, you may be also interested to see: How to Change Default OS.

1. Installing Grub Customizer
How to Install Grub Customizer on RHEL GNU/Linux
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