Adobe InDesign - Manual (Page 468)

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Adjust kerning between words
With the Type tool , select a range of text and do one of the following:
To add space between selected words, press Alt+Ctrl+\ (Windows) or Option+Command+\ (Mac OS).
To remove space between selected words, press Alt+Ctrl+Backspace (Windows) or Option+Command+Delete (Mac OS).
To multiply the kerning adjustment by 5, hold down Shift as you press the keyboard shortcut.
Adobe also recommends
Keys for working with type
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