Maggie
Ar you wanting a Horizontal Rule(<hr /> ?
If you want a full width rule with default properties, just place <hr /> between the closing </p> and the next opening <p in Code View. (hr can NOT be within a paragraph)
If you want a smaller (%) width,centered; wider; or other line style or color(s)
some CSS selector creation is called for.
Test visually, on a ADE (and maybe others) readers. WYS in Sigil-Calibre Inot WYG on thes readers.
Basically centering is not reliable on many readers.
to center a 25% width rule you make the Left Margin 32.5% to force the rule to the center.
margin-left = (100-rule_width%)/2
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