To change the boot menu title I usually just amend the file:
/boot/grub/grub.cfg
So would select / start / system / root konsole
then type in dolphin, navigate to the above location and open the grub.cfg file
then find and amend the entry
So for example the part of the file to amend the Windows entry on my system is:
menuentry ‘Windows 10’ --class windows --class os $menuentry_id_option ‘osprober-efi-CEDD-8593’ {
insmod part_gpt
insmod fat
set root=‘hd0,gpt1’
if x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 CEDD-8593
else
search --no-floppy --fs-uuid --set=root CEDD-8593
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
The bit I have marked in bold is what you want to change (in your example) to ‘Windows 10 (x64) Eng’.
Two points to note:
1 - before you make any changes make a back-up of the grub.cfg file
2 - You may need to re-do following a kernel up-date