Documents Format

[Ron Crowley]

Sent from Mail for Windows 10
Dear Sir/Madam:
     I am a current user of  Apache OpenOffice 4 mainly used for creating 
documents.
During the creation of one particular document, each line of text was separated 
by each subsequent single-line spacing.  But, half way through the document, it 
changed to double spacing.  How do I restore the document to single spacing?
    Thank you for your assistance.
Ron Crowley