Power BI Themes Skill Manage report-wide themes and per-visual conditional formatting. No Power BI Desktop connection is needed. Applying a Theme Power BI themes are JSON files that define colours, fonts, and visual defaults for the entire report. Apply one with: This copies the theme file into the report's folder and updates to reference it. The theme takes effect when the report is opened in Power BI Desktop. Inspecting the Current Theme Returns: - -- the built-in theme name (e.g. ) - -- custom theme name if one is applied (or ) - -- full JSON of the custom theme file (if it exists) Compari…