In Power BI, to let users change the y-axis category of a bar chart using a slicer, which feature should you add?

• A. Field parameters
• B. What-if parameter
• C. Slicer bookmarks
• D. Visual level filters

Answer: (A)

Field parameters let you swap which field a visual uses for its axis, legend, or values by exposing those fields as a single selectable parameter. In this case, you want users to choose which category appears on the bar chart’s y-axis. Create a Field parameter that lists the candidate y-axis fields (for example, Category, Subcategory) and use that parameter on the chart’s axis. Then add a slicer bound to the parameter so the user can pick which field drives the axis. When the slicer selection changes, the y-axis categories update accordingly. This dynamic field-switching capability isn’t provided by what-if parameters, slicer bookmarks, or simple visual-level filters, which either adjust values numerically, control state, or filter data rather than swap the axis field.