Startup video, How do I make it full screen?

I have used blueprints to make my levels run full screen. Because the Default game user settings ini file approach simply doesn’t seem to work at all.

Using blueprints to execute a fullscreen command is fine on my levels, gets the job done.

However, I don’t have blueprints on my startup video, so they seem to run windowed.

No matter what I do, this **** thing will not go full screen. On top of that, I would RATHER not have blueprints in my level for this, and have it get that data from the properties somewhere, but as I said, the INI approach which seems to be used everywhere, I can’t get to work!