Windows 10, 11 - Disable Bitlocker

Bitlocker is a disk encryption added without your consent to your new computer making it hard to resize the Windows partition in Gparted.

Symptoms:
In Gparted these partitions appear as "bitlocker" partitions that are unresizeable.

First do the following:
1. Click Start
2. Type Powershell
3. Right-click on the Windows PowerShell menu item
4. Choose Run as administrator

In the steps below replace "C:" with the drive that is encrypted.

To get status for all drives type this:
Get-BitlockerVolume

Or for a specific drive:
Get-BitlockerVolume -MountPoint "C:"

The status should say "FullyDecrypted"

If it says "FullyEncrypted" then type this to disable it:

Disable-Bitlocker -MountPoint "C:"

Disk management can also be used to check drives for BitLocker, type Win + R, type diskmgmt.msc and check if Bitlocker appears on the drives.