Power BI theme files are great for controlling a lot of properties of visuals. However, there are quite a few bugs and limitations. I think at least all properties of all standard visuals should be controllable by the theme. Unfortunately, this is not the case. Microsoft should definitely fix this. At the moment these issues make it almost impossible to create a nicely and properly working theme file which can be adopted by the entire organization.
A few clear and easy examples:
- Font sizes for slicer headers can only be affected by changing the global font size for titles... I mean, who would have guessed that. I consider this being a bug.
- Font sizes for category lables cannot be controlled by the theme at all.
- Text wrapping cannot be set by the theme.
- Style presets and layouts cannot be set by the theme.
- Etc.
A lot of these properties can be defined in the theme file and Power BI will import the file but they don't seem to have any effect on the visuals (even after choosing "Reset all settings to default").
Please fix this Microsoft Power BI Team!
Please note:
We are working with the 64bit September 2025 version of Power BI so may be some issues have been fixed already.
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