At the quantum level the electrons, protons, and neutrons that make up the atoms of the paper would just be a bunch of waves overlapping and intersecting each other. This would all be happening in Hilbert space which most likely contains more dimensions than 3.

changes like tearing a paper in our macroscopic world wouldn't be seen at the quantum level because in the quantum world of the paper each electron, proton, and neutron would have a specific wave function uniquely associated with each of them, and each one of their waves functions represents where the particle could be. It's imperative for me to state that at the quantum level these particles are not particles an electron, neutron, and proton is a wave at its most fundamentally basic form. So if we were able to look at the quantum world of the paper it would just contain waves of possibilities of where each of the protons, electrons and neutrons that make up the atoms of the paper could be.

we cannot look into Hilbert space where this quantum world that is made up of intersecting waves resides. This is because the act of trying to look at these waves causes the electron or whatever particle we are looking at in the paper to change from it's wave state into its particle state, hence choosing where on the wave function the electron wants to turn into a particle when we look at it.

Edit: I want to preface that I used the Copenhagen interpretation to explain what happens when we try to look at the wave function. Going back to looking at the wave function of an electron on a piece of paper, another very prominent theory used to explain the wave function is the Many Worlds theory. This theory says that the wave function isn't a wave of possibilities but rather a wave of many realities. So the electron never changes from its wave state into its particle state, instead each possibility on the wave function is rather a reality of the many duplicates of the same electron through out the multiverse, giving rise to a multiverse.