ToolsAutoCorrect OptionsAutoCorrect and uncheck "Capitalize first letter
of sentences"

That said, you should disable this feature because sentences are supposed to
start with capital letters. Word is not a typewriter. Pressing "Enter" is
not the same a carriage return. Pressing "enter" tells Word to start a new
paragraph. Since paragraphs start with sentences .....

You can leave the option as is and use a line break to start a new line
(Shift+Enter).

HTH

--
Greg Maxey/Word MVP
A Peer in Peer to Peer Support

wrote:
When I type a line, then enter and tab,the word in the second line is
capitalized.
How do I disable this auto capitalizing?