Aim Automated insulin delivery systems have improved glycaemic control in people with type 1 diabetes mellitus. The analysis investigated predictors of improved sensor glucose time‐in‐range (TIR; 70‐180 mg/dl) based on real‐world use of the MiniMed 780G advanced hybrid closed‐loop (AHCL) system. Methods Data uploaded by MiniMed 780G system users from August 2020‐July 2021 were analysed using univariate and multivariable models to identify baseline, demographic and system use characteristics associated with TIR after AHCL initiation (post‐AHCL). System settings associated with improved TIR post‐AHCL were identified and their impact on time below range (TBR, <70 mg/dl) post‐AHCL was explored. Results In total, 12 870 users were included, of which 2977 had baseline sensor glucose data. Baseline TIR and time in AHCL (defined as the percentage of time the system was in Auto‐mode) were positively associated with TIR post‐AHCL with larger values predicting greater mean TIR post‐AHCL. Characteristics inversely associated with TIR post‐AHCL included the percentage of daily basal insulin dose, daily autocorrection dose, number of daily AHCL exits triggered by the system and number of daily alarms, wherein larger values of these characteristics predicted lower mean TIR post‐AHCL. System settings that predicted the largest mean TIR post‐AHCL were active insulin time of 2 h and glucose target of 100 mg/dl. Active insulin time was not associated with TBR post‐AHCL. Conclusion Modifiable factors, including optimized pump settings, can allow users to achieve glycaemic targets with >80% TIR. The findings from this analysis will potentially guide the optimal use of the MiniMed 780G system and facilitate meaningful improvements in safe glycaemic control.