How can I do this?

You can't at the moment. I need to reimplement that. But the shield works with the other visibility modes though

Okay, thank you, The Shield Projector is really nice...the mod too!
I really love it <3

Do you know when this might be re-implemented? I would really really love to use this when it is ready? Thanks for a great mod by the way :)

Thank you for taking the time to create this issue, as we're no longer supporting versions below 1.12, I'm going to go ahead and close it but if this bug seems to continue over to newer versions, please do report it again so we can investigate the issue further.