We present a comprehensive study of magnetotransport in high-mobility trilayer graphene (TLG) devices under a transverse displacement field, focusing on symmetry-broken Landau levels (LLs) from monolayer-like and bilayer-like bands. A striking displacement-field-induced enhancement of the Landé $g$-factor is observed in the zeroth Landau level of the monolayer-like band, highlighting the formation of interaction-driven quantum Hall states. Additionally, we find a rich landscape of LL crossings in the Dirac gully region, accompanied by phase transitions between spin-, gully, and valley-polarized LLs. These experimental observations are successfully modeled using calculations based on optimized tight-binding parameters. Furthermore, our results reveal significant particle-hole asymmetry in the sequence of LLs in the Dirac gullies, attributed to differing $g$-factor values for electrons and holes. This asymmetry underscores the limitations of noninteracting models in capturing the complexities of multiband systems. This work provides insights into the interplay of symmetry-breaking mechanisms and enhanced interaction effects in Bernal-stacked trilayer graphene, advancing our understanding of quantum transport phenomena in multiband systems.

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• Density of states
• Magnetotransport
• Graphene
• Two-dimensional electron system