Do we live in a simulation? Is the world just a hologram? I assume that this is the same question, but see no references to holograms. Am I correct that this is the same question?
A simulation represents (in any of a variety of ways) another thing. I can simulate another person's emotions, beliefs, desires, &c. I can do this e.g. by imagining how I would think or feel in their situation as I understand it. A hologram is a representation but is limited to what can be represented by light waves. Here is President Trump and here, safely in a case, is a three-dimensional image of President Trump that looks just like him.
If we lived (wholly) in a simulation where would we get the idea of a simulation? So my answer, duly provisional, is 'no'. If you want to think further about simulation and the philosophical questions and issues it raises, I agree with Conifold that you should drop the idea of a hologram from your inquiry. It is unnecessary and irrelevant. That's not meant to be harsh statement, just a guiding judgement.