Power BI developers focus on interactivity by incorporating slicers, drill-throughs, and tooltips into reports. They use bookmarks to create guided navigation and storytelling within dashboards. Syncing slicers across multiple pages ensures seamless filtering for users. Drill-down hierarchies allow users to explore granular data levels, while parameterized visuals provide dynamic customization. Power BI developer use custom tooltips to display supplementary information without cluttering the dashboard. These techniques not only enhance user engagement but also empower stakeholders to uncover meaningful insights by interacting directly with the data.