The midrapidity transverse momentum (p t) distributions of the charged pions and kaons, protons, and antiprotons, measured by ALICE Collaboration at nine centrality groups of Xe + Xe collisions at (s nn ) 1 / 2 = 5. 4 4 TeV , have been reproduced quite well using simultaneous (combined) minimum χ 2 fits with the simple (non-consistent) as well as thermodynamically consistent Tsallis function with included transverse flow. The parameters T 0 , 〈 β t 〉 , and q extracted in this work using both consistent and non-consistent Tsallis function with included transverse flow demonstrate the similar dependencies on collision centrality (〈 N part 〉). The obtained non-extensivity parameter q values decrease systematically for all studied particle species with increasing Xe + Xe collision centrality, indicating an increase in degree of system thermalization with increasing centrality of heavy-ion collisions. The average transverse flow velocity demonstrates significantly different growth rates in regions 〈 N part 〉 < 4 4 ± 5 and 〈 N part 〉 > 4 4 ± 5 , and parameter T 0 stays constant within uncertainties in 〈 N part 〉 > 4 4 ± 5 range in Xe + Xe collisions at (s nn ) 1 / 2 = 5. 4 4 TeV. It is argued that 〈 N part 〉 ≈ 4 4 ± 5 (〈 d N ch / d η 〉 ≈ 1 5 8 ± 2 0) could possibly be a threshold border value for a crossover transition from a dense hadronic state to the QGP phase (or mixed phase of QGP and hadrons) in Xe + Xe collisions at (s nn ) 1 / 2 = 5. 4 4 TeV. Depletion (enhancement) of (p + p ̄) / (π + + π −) ratio at low p t (intermediate p t ) has been observed in this work in Xe + Xe collisions at (s nn ) 1 / 2 = 5. 4 4 TeV , which agrees with the similar results of ALICE Collaboration obtained recently in high-energy Xe + Xe and Pb + Pb collisions at the LHC. Analyzing and reflecting the extracted 〈 β t 〉 versus N part and (p + p ̄) / (π + + π −) versus 〈 d N ch / d η 〉 dependencies, we have verified that the depletion (enhancement) of baryon-to-meson ratio at low p t (intermediate p t ) values with increasing 〈 d N ch / d η 〉 is due to radial flow effects. [ABSTRACT FROM AUTHOR]