Dependence of the effective radius of the GC system for the 12 UDGs with N_GC > 10 (black filled circles) on three host parameters: the total number of GCs associated with the UDG (top), the stellar mass of the host galaxy (middle), and the effective radius of the UDG (bottom). We find that the effective radius of the GC system matches the effective radius of the galaxy (grey dotted line), indicating that the radial distribution of GCs follows the galaxy light. For all plots, the best-fit relations of Lim et al. (2024) are shown by the grey line (all GCs), the blue line (blue GCs), and the red line (red GCs). The error bars are shown for both axes in all plots but are only visible when larger than the symbols.