You have to delete the registry file with regedit for the volume you want to remove the drive letter.

1. Open Windows Powershell or the command line as administrator: Start→Right click Powershell→Run as administrator

2. Open diskpart: diskpart

3. Identify the EFI partition showing up in Explorer: list volume

How to bypass the internet requirement during Windows 11 setup? You can run the OOBE BypassNRO command to bypass the internet requirements. To bypass the internet requirement and use Windows 11 with a local user account, follow these steps:

1. Begin the Windows 11 setup process.

Origin document here

Fixing Trust Relationship Issue between Client and Domain

Method 1: Manual​

Steps to resolve the issue: