Hi @mark goldin ,
If you want to remove the margins of the category axis, make it close to 0 position, etc., it depends on what type of chart you use. In Bar, Column and Scatter chart types, the chart automatically adds side margins on the ends of the x-axis. You cannot change the size of the margin. In all other chart types, the chart does not add side margins. For more information , see Add or Remove Margins from a Chart (Report Builder and SSRS).
By default, the chart will only display axis labels for data points in the dataset that contain valid values. For example, if you have values of 1, 2, and 6 on the category axis, the chart will only show categories 1, 2, and 6. To maintain the scale of category values, you can specify the chart to use a scalar axis. In this scenario, the chart will show labels for 1-6 on the x-axis of the chart, even though your dataset does not contain values for 3-5.
For more information, please refer to: Formatting-axis-labels-on-a-chart-report-builder-and-ssrs.
Best Regards,
Joy
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