Upper panels: dielectron $m_{\rm ee}$-differential yields in the 10\% most central Pb--Pb collisions at \mbox{\fivenn,} compared with the expected e$^{+}$e$^{-}$ contributions from known hadronic decays, including two different estimations for dielectrons from correlated heavy-flavor hadron decays (left panel), and two predictions for thermal radiation from the medium  (right panel). Bottom panels: ratios data to cocktails, together with the expected ratios from the models. The error bars and boxes represent the statistical and systematic uncertainties of the data, respectively, whereas the bands show the uncertainties of the hadronic cocktails.