On startup/restart GRUB only gives the option to select Linux Endeavour and no Windows. Running sudo os-prober detects Windows, GRUB_DISABLE_OS_PROBER=false is there, but still running sudo grub-mkconfig -o /boot/efi/EFI/endeavouros/grub.cfg gives Warning: os-prober will not be executed to detect other bootable partitions And as expected, no option to select Windows on boot. I’m new to Linux (installed Endeavour just today after finally getting fed up with Windows) so Idek what I’m doing or what any of these mean. Thanks.
You need to remove the # from the line:
#GRUB_DISABLE_OS_PROBER=false
PS. Please post the terminal output as text formatted with </> in the toolbar. Thanks!
Welcome to the forum 
You have to remove # in front of the osprober option to get it working.
Thanks a lot it’s working 
I’m such an idiot it didn’t hit me that maybe # means it’s a comment and I need to remove it 
Thanks a lot it’s working I’m so dumb it never occurred to me that maybe # means it’s a comment and I need to remove it
It is easy to overlook small details. It happens to everybody once in a while. Good you could solve the issue and welcome to the community!
tysm