Left: The $N_{\rm ch}$ dependence of the second-order two-particle correlation coefficient $V_{2\Delta} (\rm{2PC})$, estimated using the template-fit method, in pp ($|\Delta \eta| > 5.0$) collisions at $\sqrt{s} = 13$ TeV, and compared with predictions from the 3D-Glauber + MUSIC + UrQMD model , as well as with PYTHIA8 variations with string-shoving  and ropes  implementations. Right: The $N_{\rm ch}$ dependence of the $V_{2\Delta} (\rm{2PC})$, estimated using template-fit method, in p--Pb ($|\Delta \eta| > 5.0$ and $|\Delta \eta| > 6.5$) collisions at $\snn=5.02$ TeV and its comparison with the 3D-Glauber + MUSIC + UrQMD predictions.