  Holographic screens are codimension-one hypersurfaces that extend the notion
of apparent horizons to general (non-black hole) spacetimes and that display
interesting thermodynamic properties. We show that if a spacetime contains a
codimension-two, boundary-homologous, minimal extremal spacelike surface $X$
(known as an HRT surface in AdS/CFT), then any holographic screens are
sequestered to the causal wedges of $X$. That is, any single connected
component of a holographic screen can be located in at most one of the causal
future, causal past, inner wedge, or outer wedge of $X$. We comment on how this
result informs possible coarse grained entropic interpretations of generic
holographic screens, as well as on connections to semiclassical objects such as
quantum extremal surfaces.
