Shows hidden formatting symbols in your text, such as paragraph marks, line breaks, tab stops, and spaces.
To access this command...
From the menu bar:
Choose View - Formatting Marks
From the tabbed interface:
Choose Home - Toggle Formatting Marks.
Choose Insert - Formatting Marks.
From the keyboard:
CommandCtrl + F10
When you delete a paragraph mark, the paragraph that is merged takes on the formatting of the paragraph that the cursor is in.
To specify which formatting marks are displayed, choose LibreOffice - PreferencesTools - Options - LibreOffice Writer - Formatting Aids, and then select the options that you want in the Display formatting area.