Add markings and labels to a chart in Keynote on Apple Vision Pro
There are several types of chart markings and axis labels you can add to your charts. You can modify their look to emphasize your data, and you can style the chart title and value label text differently to make it stand out from the other text.
Add a legend
Tap the chart, tap
Tap the chart, then do any of the following:
Change the style of the legend text: Tap
Reposition the legend: Pinch and drag the legend to where you want it.
Modify axis lines and gridlines
Axis lines define the edge of the chart, sometimes also marking the zero value, like an inner border. Evenly spaced gridlines cross the chart and provide a visual reference for large increments in the values. You can specify whether to show chart axis lines and gridlines and modify their look.
Tap the chart, then tap
Tap Style, tap Gridlines, then do any of the following:
Set the axis line type: Tap Line Type, then select a solid, dashed, or dotted line type.
If you’re working with a radar chart, you can also tap Radial Lines (below Category) and select a line type.
Set the axis line color: Tap the color well, then choose a color.
Set the axis line width: Type a value, or tap the – or + button.
Set the number and look of major gridlines: Tap Major Gridlines for the Value or Category axis. Turn on Gridlines. Next to Major Steps, type a value or tap the – or + button to adjust. You can also define the line type, color, and width and add a shadow.
Set the number and look of minor gridlines: Tap Minor Gridlines for the Value or Category axis. Turn on Gridlines. Next to Minor Steps, type a value or tap the – or + button to adjust. You can also define the line type, color, and width and add a shadow.
Show tick marks: Tap Tick Marks, then choose whether tick marks are inside, outside, or centered.
Extend radial lines (for radar charts): Turn on Extend Radial Lines.
Note: These options vary depending on the type of chart and data.
To remove gridlines, tap
Show or remove reference lines
You can add reference lines to a chart to mark the average, median, minimum, or maximum values. Reference lines make a chart easier to interpret at a glance and can help you compare the values in the chart to a benchmark value.
All chart types can have reference lines except stacked charts, 2-axis charts, 3D charts, pie charts, donut charts, and radar charts. A chart can have up to five reference lines.
Tap the chart, tap
Tap Add Reference Line, then tap an option, such as Average, Minimum, or Custom.
To clarify what the reference line represents, tap to turn on Show Name and Show Value.
To change the settings for a reference line, tap the name of the line, then use the controls in the panel.
You can hide, show, and change the line’s name or value, change its style and color, and add a shadow.
To remove a reference line, tap the chart to select it, tap 
Note: When you drag the slider on an interactive chart to view different data sets, its reference lines move.
Show or remove error bars
Error bars give you a general impression of your data’s accuracy. They’re represented as small marks whose length indicates the amount of uncertainty associated with a given data series (the data’s variability). You can add them to 2D line charts, area charts, bar and column charts, stacked bar and column charts, bubble charts, and scatter charts.
Tap the chart, tap
Tap Error Bars, then choose an option.
Use the controls to change the look of the error bars.
To remove error bars, tap Error Bars, then choose None.
Show or remove trendlines
Trendlines show you the overall direction (or trend) of your data. Trendlines appear in bar, line, scatter, bubble, column, and area charts.
Tap the chart, tap
Tap Trendlines, then choose the type of line you want to add.
Use the controls to change the look of the trendline.
To remove trendlines, tap the chart, tap
Change the font, style, and size of chart text
You can change the look of all the chart text at once.
Tap the chart, then tap
Tap Style, then tap Labels.
Do any of the following:
Change the font: Tap Chart Font, then tap a font name.
Change the font style: Tap Chart Font, tap
Make the font smaller or larger: Tap
All text in the chart increases or decreases proportionally (by the same percentage).
Edit the chart title
Charts have a placeholder title (Title) that’s hidden by default. You can show and rename the chart title.
Tap the chart, tap
To see and change the alignment of the title—so that it’s on the left of the chart, for example—tap the chart, tap
To edit the title, double-tap it (a box appears around it), then select the text, then type a new title.
Add and modify chart value labels
Charts have labels that show the values of specific data points. You can specify a format for them (for example, number, currency, or percentage), change where they appear or how they look, and more.
Tap the chart, then tap
Tap Style, then tap Labels.
To add value labels, do one of the following:
For pie or donut charts: Turn on Values.
You can also display data labels in pie charts and donut charts by turning on Data Point Names.
For bubble charts: Tap Values below Bubble Labels, then choose which values to display.
For scatter charts: Tap Values below Data Point Labels, then choose which values to display.
For other types of charts: Tap Value Labels, then choose an option.
To fine-tune the value labels, tap Number Format, turn off Same as Source, then do any of the following (these controls are available only for some chart types):
Choose a format for the label: Tap a format (for example, Number, Currency, or Percentage).
Set the number of decimal places: Tap
Show the thousands separator: Tap
Choose how to display negative numbers: Tap
Add a prefix or suffix: Enter text. It’s added to the beginning or end of the label.
Note: If you leave Same as Source turned on, the value labels are displayed in the same format as the source data in the original table.
To change the font, color, and style of all labels, use the controls at the top of the Labels tab.
If you created a pie or donut chart, you can position the value and data labels, and add leader lines to connect them to their wedges or segments. In the Labels tab, tap Position, then do any of the following:
Change the position of the labels: Pinch and drag the Distance from Center slider to set where the labels appear. Moving the labels farther from the center of the chart can help separate overlapping labels.
Add leader lines: Turn on Leader Line, then tap Straight or Angled. (With angled leader lines, the callouts align into columns, as shown below.) You can change the line type, color, and width of the leader lines and add endpoints to them.
Modify axis labels
You can specify which labels appear on an axis, edit their names, and change their angle of orientation.
Tap the chart, then tap
Tap Style, then tap Labels.
Do any of the following:
Modify markings on the Category (X) axis: Tap Value Labels under Value (X) Axis.
Modify markings on the Value (Y) axis: Tap Value Labels under Value (Y) Axis.
Use the controls to make any adjustments.
If you turn on Axis Name, Keynote adds a placeholder axis name to the chart. To change it, select the axis name, then type your own.
Note: Axis options may be different for scatter and bubble charts.