Hi Almeria,
Thanks for using Syncfusion products.
Query #1: How to resize the symbol of outliers in a box-plot, when I make a chart with less series points.
We suggest you to set "OutLierWidth" property of box and whisker item to customize the size of outlier width.
Please refer the following code snippet to achieve this.
<code>
[CS]
//Customizing width of outliers
this.chartControl1.Series[0].ConfigItems.BoxAndWhiskerItem.OutLierWidth = 15;
</code>
Query #2: Can the outliers can be hide or unhide in Box-plot chart?
We can hide or unhide outliers using "PercentileMode" property of box and whisker item.
Please refer the following code snippet to achieve this.
<code>
[CS]
//Enable or disable percentile mode
this.chartControl1.Series[0].ConfigItems.BoxAndWhiskerItem.PercentileMode = true;
</code>
For your convenience, we have created a simple sample and it can be downloaded form the following link.
Box_And_WhiskerPlease let us know if you have any concern.
Regards,
Anand