Left: G, G_BP–G_RP CMD of all sources in our catalogue of ∼160 thousand objects within the area delimited by our selection around the centre of UMi. The magenta and cyan filled circles mark the RR Lyrae stars classified by Gaia DR3. The red, orange, and blue symbols mark the UMi members from Kirby et al. (2010), Pace et al. (2020), and Sestito et al. (2023), respectively. Right: zoomed-in image of the left panel. The yellow filled black circles highlight 20 sources classified as RR Lyrae by Gaia DR3, located beyond 12 times the elliptical half-light radius of the galaxy.