Step 1: Open the command prompt.
Step 2: Type the command below you want to use into the elevated command prompt, and press Enter.
To Add
powercfg -attributes SUB_VIDEO 8EC4B3A5-6868-48c2-BE75-4F3044BE88A7 -ATTRIB_HIDE
To Remove
powercfg -attributes SUB_VIDEO 8EC4B3A5-6868-48c2-BE75-4F3044BE88A7 +ATTRIB_HIDE
Step 3: You can now close the command prompt if you like