  We present a theoretical study of the medium modifications of the $p_T$
balance ($x_J$) of dijets in Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV. The
initial production of dijets was carried out using the POWHEG+PYTHIA8
prescription, which matches the next-to-leading-order (NLO) QCD matrix elements
with the parton shower (PS) effect. The SHELL model described the in-medium
evolution of nucleus-nucleus collisions using a transport approach. The
theoretical results of the dijet $x_J$ in the Xe+Xe collisions exhibit more
imbalanced distributions than those in the p+p collisions, consistent with
recently reported ATLAS data. By utilizing the Interleaved Flavor
Neutralisation, an infrared-and-collinear-safe jet flavor algorithm, to
identify the flavor of the reconstructed jets, we classify dijets processes
into three categories: gluon-gluon ($gg$), quark-gluon ($qg$), and quark-quark
($qq$), and investigated the respective medium modification patterns and
fraction changes of the $gg$, $qg$, and $qq$ components of the dijet sample in
Xe+Xe collisions. It is shown that the increased fraction of $qg$ component at
a small $x_J$ contributes to the imbalance of the dijet; in particular, the
$q_1g_2$ (quark-jet-leading) dijets experience more significant asymmetric
energy loss than the $g_1q_2$ (gluon-jet-leading) dijets traversing the QGP. By
comparing the $\Delta \langle x_J\rangle = \langle x_J \rangle_{pp} - \langle
x_J \rangle_{AA}$ of inclusive, $c\bar{c}$ and $b\bar{b}$ dijets in Xe+Xe
collisions, we observe $\Delta\langle x_J \rangle_{incl.}>\Delta \langle x_J
\rangle_{c\bar{c}}>\Delta \langle x_J \rangle_{b\bar{b}}$. Moreover, $\rho_{Xe,
Pb}$, the ratios of the nuclear modification factors of dijets in Xe+Xe to
those in Pb+Pb, were calculated, which indicates that the yield suppression of
dijets in Pb+Pb is more pronounced than that in Xe+Xe owing to the larger
radius of the lead nucleus.
