Add a legend, grid lines and other markings in Keynote on Apple Vision Pro
There are several types of graph markings and axis labels you can add to your graphs. You can modify their look to emphasise your data, you can style the graph title and value label text differently to make them stand out from the other text.
Add a legend
Tap the graph, tap
Tap the graph, 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 grid lines
Axis lines define the edge of the graph, sometimes also marking the zero value, like an inner border. Evenly spaced grid lines cross the graph and provide a visual reference for large increments in the values. You can specify whether to show graph axis lines and grid lines and modify their look.
Tap the graph, 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 colour: Tap the colour well, then choose a colour.
Set the axis line width: Type a value, or tap the – or + button.
Set the number and look of major grid lines: 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, colour and width and add a shadow.
Set the number and look of minor grid lines: 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, colour and width and add a shadow.
Show ticks: Tap Tick Marks, then choose whether tick marks are inside, outside or centred.
Extend radial lines (for radar graphs): Turn on Extend Radial Lines.
Note: These options vary depending on the type of graph and data.
To remove grid lines, tap
Show or remove reference lines
You can add reference lines to a graph to mark the average, median, minimum or maximum values. Reference lines make a graph easier to interpret at a glance and can help you compare the values in the graph 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 graph can have up to five reference lines.
Tap the graph, 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 colour, and add a shadow.
To remove a reference line, tap the graph to select it, tap 
Note: When you drag the slider on an interactive graph 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 graphs, area graphs, bar and column graphs, stacked bar and column graphs, bubble charts and scatter plots.
Tap the graph, 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 graph.
Tap the graph, 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 graph, tap