Is it possible to use Apple remote desktop to macOS High Sierra and disable the screen on the remote station?
As Allan said in a comment, Apple Remote Desktop supports this functionality with the Curtains command, so if you're using a third-party client to access your computer with the Apple Remote Desktop protocol it's up to that client to provide a way for you to activate that feature.

If you're accessing a MacBook using its built-in display, you could always simply decrease the brightness to zero. Technically the display is still active, but it's practically impossible to see in most conditions. You can also do this for an iMac, though the backlight does not dim fully. You can do this in System Preferences > Displays, if you can't send the key commands to decrease brightness.