Keynote

Adjust the character spacing in Keynote for iCloud

You can increase or decrease the spacing between characters in any text. You might want to do this, for example, to experiment with line length, or to make a title fit on a single line.

Select the text you want to change.
In the Format sidebar on the right, click the Style button near the top.
If the text is in a table cell, click the Cell tab at the top of the sidebar instead of the Style button.
In the Font section, click the Action pop-up menu , then use the arrows to change the Character Spacing value.
The default spacing is 0. Increasing the value widens the spacing, and decreasing the value tightens it.

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Keynote User Guide for iCloud

Adjust the character spacing in Keynote for iCloud