  Employing the low-energy effective theory alongside a combination of
analytical and numerical techniques, we explore the Landau level collapse
phenomenon, uncovering previously undisclosed features. We consider both
finite-width graphene ribbons and semi-infinite geometries subjected to a
perpendicular magnetic field and an in-plane electric field, applied
perpendicular to both zigzag and armchair edges. In the semi-infinite geometry
the hole (electron)-like Landau levels collapse as the ratio of electric and
magnetic fields reaches the critical value $ +(-) 1$. On the other hand, the
energies of the electron (hole)-like levels remain distinctive near the edge
and deeply within the bulk approaching each other asymptotically for the same
critical value. In the finite geometry, we show that the electron (hole)-like
levels become denser and merge forming a band.
