In Power BI, a JSON theme file dictates the default appearance of all visuals in a report, such as chart colors and border styles. Use report themes in Power BI - Microsoft Learn
Depending on whether you are building a modern website or a data report, a theme.json file serves as the "brain" for your design, controlling everything from colors and fonts to layout spacing. themes.json
: Assigns specific styles (like font size or background color) to elements or blocks. templateParts : Registers parts like headers or footers. Quick Template In Power BI, a JSON theme file dictates
: Enables/disables UI tools and defines presets like your color palette and typography. In Power BI