We investigate the evolution of polarized electronic response in trilayer nickelate ${\mathrm{La}}_4{\mathrm{Ni}}_3{\mathrm{O}}_{10}$, reporting a systematic reduction of the incoherent electron continuum across the density wave transition in the $A_{1g}$ and $B_{1g}$ representations. Analysis based on the Fermi surface band curvatures points to quasiparticle coherence in momentum positions with dominant $d_{x^2-y^2}$ orbital character. Our findings establish the symmetry channels and the active role of $d_{x^2-y^2}$ orbitals involved in the density wave formation, offering important insight into the electronic and magnetic correlations in the nickelate.

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• Magnetic phase transitions
• Quasiparticles & collective excitations
• Stripes
• Nickelates
• Ruddlesden-Popper compounds
• Inelastic light scattering