How to boot windows after install Ubuntu

how to boot windows after install Ubuntu ?
on GNU GRUB I select windows 10 (on/dev/sda1) but is not boot to windows it boot to come back to GNU GRUB again
How I can fix it.

Hi, that is unfortunate but first and foremost, this is a forum for node-red (not PC issues)

One thing I will say is - WHY would you do that?

Why didn't you simply use WSL or a Hyper-V virtual machine for running linux (assuming you wanted to keep windows)

Any how - the best place to start is here

Thank you I try

Just want to second the recommendation for WSL, it can really help to ease the transition between Linux and Windows or vice versa. Way better than dual booting.