Change the look of bars, wedges and more in Numbers on Mac
A data series is a set of related values in a graph — for example, all the bars of the same colour in a bar graph, or a single line in a line graph.
You can emphasise trends in your graph by changing the appearance, position or spacing of one or more of the data series.
Change colours and shadows in graph elements
You can change the look of any data series in a graph to differentiate it from other series. For bar graphs, for example, you can fill the bars in each series with a different colour or a colour gradient, apply a different outline (stroke) style and more. For scatter plots, you can change the symbol that represents each point and add connection lines between the points.
Note: You can’t change the look of a single data point in a series (a single bar in a bar chart, for example). All changes you make apply to every data point in the series.
Click the graph, then click one element of a data series (for example, one bar or column, pie wedge, or scatter point).
The entire data series is selected.
In the Format
sidebar, click the Style tab.Use the controls in the sidebar to make changes; to see all options, you may need to click the disclosure triangle next to the name of each section.
The changes affect only the selected data series. To change another series, click one of its elements, then make changes.
To select multiple series, click a series element, then Command-click an element in another series. To select all series, click a series element, then press Command-A.
Tip: You can select a coordinated set of colours for all the data series in the graph at once. Click the graph, click the Graph tab in the sidebar, then click 
and select colours. To preview the colours in your graph, hold the pointer over a colour combination.
Change the spacing in bar and column graphs
You can set the amount of space between the columns or bars in a column, stacked column, bar or stacked bar chart.
Click the graph, then in the Format
sidebar, click the Graph tab.Click the disclosure triangle next to Gaps, then set the amount of space.
Add rounded corners to bar, column, mixed and two-axis graphs
Click the graph to select it, then click Graph in the Format
sidebar.Click the disclosure triangle next to Rounded Corners, then drag the slider or type a specific value.
To round only the two outside corners of each bar or column (those furthest from the axis), select the Outside Corners Only tick box.
Change the depth of a 3D graph and the shape of series elements
You can change the graph depth, lighting style, bar shape, bevels and rotation of 3D graphs.
Click the 3D graph to select it, then in the Format
sidebar, click the Graph tab.Click the disclosure triangle next to 3D Scene, then use the controls to make adjustments.
Bevel the edges between series or wedges in 3D stacked and pie charts
Change the position of pie chart wedges and doughnut chart segments
Select the pie or doughnut chart.
Do one of the following:
Move only selected wedges or segments: Double-click the wedge or segment or Command-click multiple items, then drag.
Move all wedges in a pie chart: In the Format
sidebar, click the Wedges tab. Click the disclosure triangle next to Wedge Position, then drag the Distance from Centre slider to separate the wedges.
You can also move the Rotation Angle control to change the orientation of pie wedges or doughnut segments. You may want to emphasise some data, for example, by positioning certain wedges at the top or bottom of the graph.
Resize the centre hole of a doughnut chart
Click the doughnut chart to select it.
In the Format
sidebar, click the Segments tab.In the Inner Radius section of the sidebar, drag the slider or type a specific value.
Add or change data symbols in line and scatter graphs
You can change the symbols used to represent data in scatter graphs.
Click the graph to select it.
In the Format
sidebar, click the Series tab.Click the pop-up menu below Data Symbols and choose a symbol, or choose None to remove symbols from the graph.