Distribution of the TNG50-1 UDGs selected in our sample in the (left) M_g − R_e, (middle) M_* − M_dyn, and (right) M_* − M_gas space marked in teal stars. To compare with the observed populations, the UDGs obtained from Leisman et al. (2017), Román & Trujillo (2017), Shi et al. (2017), Janowiecki et al. (2019), Marleau et al. (2021), Kadowaki et al. (2021), Poulain et al. (2022), and Jones et al. (2023) are superposed on the left panel. Similarly, on the middle and the right panel, the stellar, dynamical, and gas masses of the UDGs taken from Guo et al. (2020), Mancera Piña et al. (2020), Karunakaran et al. (2020), Marleau et al. (2021), Kong et al. (2022), and Kado-Fong et al. (2022) are shown for comparison. The teal dots represent the remaining UDGs identified in TNG50-1 while the grey dots denote the whole sample space from which the UDGs were selected.