Left: comparison of the $\pT$-differential $v_2^{\rm \mu} \lbrace {\rm 2PC} \rbrace$ of inclusive muons at forward rapidity in high-multiplicity p--Pb collisions at $\sNN =$ 8.16 TeV with CGC-based calculations . The predictions are shown for muons from charm-hadron decays and beauty-hadron decays, separately, and for muons from the combination of the two sources. Right: comparison of the $\pT$-differential $v_2$ of muons from heavy-flavour hadron decays as obtained with CGC and AMPT calculations with the measured inclusive muon $v_2$.