On the Edit – Advanced menu, you’ll find the Delete Horizontal White Space (interesting, i thought whitespace was one word) command bound to Ctrl+K, Ctrl+\.

Delete Horizonta lWhite Space Command on Edit Advanced menu

To use, put the cursor anywhere in the whitespace that precedes the line, and press Ctrl+K, Ctrl+\.  You can also select multiple lines and delete the whitespace at the beginning of each line.

Deleted horizontal whitespace

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