How to: Edit text in slide view in PowerPoint.
Solution:
Select the desired text (if changing the spacing in only a portion of the document). Select 'Paragraph...' from the 'Format' menu and click the 'Indents and Spacing' tab. Select a line spacing amount and click 'OK'.
1) (Optional) Select the desired text if changing the line spacing for only a portion of the document.
2) Select the 'Format' menu and select 'Paragraph...'. (The 'Paragraph' dialog box appears.)
3) Click 'Indents and Spacing' tab.
4) Select the desired amount of spacing between text from the 'Line Spacing' drop-down list box in the 'Spacing' group.
5) Click 'OK'.