Icon for folders

[vinceliuice]

Icon for folders

[KolinGuo]

I was searching on the web and found across this post relating to your issue.

Basically, update-grub uses the setup scripts inside folder /etc/grub.d to generate grub boot entries and grub themes use the class of each boot entry to associate an icon with it.
Therefore, you need to modify the setup scripts by adding a class to each boot entry whose icon you want to change.

For the "Advanced Options for Ubuntu" submenu you mentioned, you need to modify the script /etc/grub.d/10_linux (or other similar file names depending on your Linux distribution).

• Locate the line echo "submenu '$(gettext_printf "Advanced options for %s" "${OS}" | grub_quote)' \$menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"
• Modify it by adding ${CLASS}
  This will set this submenu to the same class of your Linux distribution, i.e. Ubuntu, Arch, etc.
  If you want a different icon, you should add --class [ICON_NAME] with an existing ICON_NAME in assets of this repo.
• It should now looks like ... grub_quote)' ${CLASS} \$menuentry_id_option ...
  or ... grub_quote)' --class [ICON_NAME] \$menuentry_id_option ...

In my situation, I also want to change the "System Setup" boot entry icon. Below are steps to do so.

• Use grub customizer to find the setup script that generates the boot entry. In my case, it's /etc/grub.d/30_uefi-firmware
• Add a line CLASS="--class [ICON_NAME]" below the two export lines
• Add the CLASS option in the menuentry line
  menuentry '$LABEL' ${CLASS} \$menuentry_id_option 'uefi-firmware'

After you finished modifying the classes, run the install.sh script of this repo to update the changes.

[NullDev]

Awesome! Thank you for the heads up :)
Ill try that out and will close this issue now, as it's not directly related to the theme.
Thank's for letting me know!