Charmed baryon decays at Belle and Belle II

Belle and Belle II experiments have collected $e^{+}{e}^{-}$ collision data with center-of-mass energies at or near the $\mathrm{{\rm Y}}(4S)$ resonance. Using total $1.4{\mathrm{a}\mathrm{b}}^{-1}$ combined dataset, we present new measurements of branching fractions for ${\mathrm{\Xi }}_c^{0\mathrm{/}+}$ and ${\mathrm{\Lambda }}_c^{+}$ baryons, including several first observations. Additionally, we report the initial search for $CP$ violation in singly Cabibbo-suppressed three-body decays of charmed baryons, providing a test of $U$-spin symmetry.