In OutSystems, when working with pie charts, especially when slices are too small, they might not be visible or easily distinguishable. Here are a few ways to address this issue and ensure that all slices are visible:

1. Customize the Pie Chart to Show Small Slices

You can customize the Highcharts configuration (which OutSystems uses for its charts) to ensure that small slices are displayed. One approach is to use the dataLabels and tooltip options to ensure small slices are highlighted.

2. Set a Minimum Size for Pie Slices

Highcharts allows you to set a minimum size for pie slices. You can configure this in the advanced format of the chart options.

3. Combine Small Slices into a Single Slice

If you have multiple small slices, you might want to combine them into a single "Others" slice for better visibility.

Implementing the Solution

Step-by-Step Guide

1. Customize Chart Options:

   • Go to the pie chart widget in your OutSystems project.
   • Open the "Advanced Format" property.

2. Add the Configuration for Small Slices:

   • Use the following JSON configuration to customize your pie chart:
   • {  "chart": {
         "type": "pie"
       },
       "plotOptions": {
         "pie": {
           "dataLabels": {
             "enabled": true,
             "format": "{point.name}: {point.y:.2f}%"
           },
           "showInLegend": true,
           "size": '100%',
           "minSize": 5, // This ensures that small slices are visible
           "dataLabels": {
             "distance": -30, // Adjust as necessary
             "formatter": function() {
               if (this.y > 0) {
                 return this.point.name + ': ' + this.y + '%';
               }
               return null;
             }
           }
         }
       },
       "tooltip": {
         "pointFormat": '{series.name}: {point.percentage:.1f}%'
       }
     }
3. Add the Data:
   • Ensure that your data includes all slices, even those with very small values.
4. Combine Small Slices (if needed):
   • If you want to combine small slices, you can preprocess your data in OutSystems before binding it to the chart.

 set these options directly in the chart json .