  The transport properties of quark-gluon plasma created in relativistic
heavy-ion collisions are quantified by an improved global Bayesian analysis
using the CERN Large Hadron Collider Pb--Pb data at
$\sqrt{s_{\textbf{NN}}}=2.76\;$ and $5.02\;$TeV. The results show that the
uncertainty of the extracted transport coefficients is significantly reduced by
including new sophisticated collective flow observables from two collision
energies for the first time. This work reveals the stronger temperature
dependence of specific shear viscosity, a lower value of specific bulk
viscosity, and a higher hadronization switching temperature than in the
previous studies. The sensitivity analysis confirms that the precision
measurements of higher-order harmonic flow and their correlations are crucial
in extracting accurate values of the transport properties.
