ATLAS measured the centrality dependence of the dijet yield using
165
 
 
nb
−
1
of
p
+
Pb
data collected at
√
s
NN
=
8.16
 
 
TeV
in 2016. The event centrality, which reflects the
p
+
Pb
impact parameter, is characterized by the total transverse energy registered in the Pb-going side of the forward calorimeter. The central-to-peripheral ratio of the scaled dijet yields,
R
CP
, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The
R
CP
shows a scaling with the Bjorken
x
of the parton originating from the proton,
x
p
, while no such trend is observed as a function of
x
Pb
. This analysis provides unique input to understanding the role of small proton spatial configurations in
p
+
Pb
collisions by covering parton momentum fractions from the valence region down to
x
p
∼
10
−
3
and
x
Pb
∼
4
×
10
−
4
.