Hello HokkaidoLV1,
Thank you for posting in Microsoft Community forum.
I'm sorry to hear that you're having trouble returning to the main operating system. If the "Choose an operating system" menu did not appear on the Windows Recovery Environment, you may need to try a different method to return to your main operating system. Here are a few steps you can try:
- Use a Windows installation media to repair your main operating system. You can create a Windows installation media using the Media Creation Tool from Microsoft's website.
- If you have a system image backup of your main operating system, you can use it to restore your system to a previous state.
- If you have a recovery drive for your main operating system, you can use it to boot your system and access the recovery options.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan