Change the font, size, or style of text in Keynote for iCloud
You can choose the font, font size, style (for example, bold, italic, underline, or strikethrough), or color of any text, including entire paragraphs or just a few words or letters.
You can also apply preset paragraph styles to quickly change the font, size, color, or style of the text in a paragraph.
Change the font, size, style, or color of text
You can change the font, size, or color of any text selection.
Select the text you want to change.
In the Format
sidebar on the right, click the Style button near the top. In the Font section, choose a font, size, or style. To change the color of the selected text, click the color well (it looks like a rectangle), then choose a new color.
Change the paragraph style
Most themes include predesigned paragraph styles that specify a font, size, color, and other text attributes. You can use paragraph styles to ensure a consistent look for the text in your presentation.