Self-normalised yield ratios of ${\rm K^0_S}$ in pp collisions at $\sqrt{s} = 13 \rm TeV$ in the high-/low-local-multiplicity, high-/low-$ZN$-energy selections compared to PYTHIA 8 Monash and QCD-CR+Ropes predictions. The classes at fixed multiplicity are displayed in the top panels, and the classes at fixed leading energy are displayed in the bottom panels. The results from PYTHIA 8 with Monash and QCD-CR+Ropes tunes are shown with dashed and full lines, respectively. Statistical and total systematic uncertainties are shown by error bars and boxes, respectively.