This study examines Swedish principals’ perceptions of their learnings and leadership development and identifies lasting changes to their leadership practices. Data were collected through a digital survey involving 66 novice principals who had previously participated in the National Principal Training Programme. The qualitative inductive content analysis revealed four key themes: (1) development of adaptive leadership, (2) enhanced communication capabilities, (3) improved preparedness for the unexpected, and (4) development of digital leadership. Principals reported that their experiences fostered adaptive and trust-based leadership, collaborative decision-making, and strategic crisis management. Enhanced digital competencies streamlined operations but challenged social cohesion. The findings highlight how adaptive leadership was key to navigating uncertainty, maintaining organisational stability, and fostering innovation during crises. The study suggests that principals’ adaptive practices, initially developed in response to the pandemic, have become embedded in their leadership strategies, contributing to sustainable improvements in school practice. Implications for future research include exploring the long-term impact of these practices on educational outcomes, resilience, and leadership preparation programs across different national contexts.