If you are disabling bitlocker for all drives the data drives need to be disabled first before you can disable the OS drive.
 
Here is a screen shot of what the drives would look like when BitLocker is enabled.
 ![Exported image](Exported%20image%2020250808202522-0.png)  

To disable bitlocker on data drives open an elevated PowerShell console and run the following:  
Disable-bitlocker -mountpoint \<drive letter:\>  
Ex: disable-bitlocker -mounpoint "d:"

![Exported image](Exported%20image%2020250808202523-1.png)  

You can use the cmdlet get-bitlockervolume to monitor the progress of the drive being decrypted by following the "Encryption Percentage"
 
If you want to disable bitlocker on multiple drives at once you can run the following:  
Disable-bitlocker -mountpoint \<drive letter:\>,\<drive letter:\>  
Example: disable-bitlocker -mountpoint "e:","S:"

![Exported image](Exported%20image%2020250808202524-2.png)  

Screenshot of when BitLocker is disabled on all drives.
 ![Exported image](Exported%20image%2020250808202525-3.png)