Shows hidden formatting symbols in your text, such as paragraph marks, line breaks, tab stops, and spaces.
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Choose View - Formatting Marks
On Standard bar, click
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.