When the insertion point is at the beginning of a new line in a content placeholder, you can press SHIFT+TAB to indent the item.

SHIFT+TAB

A keyboard shortcut used to reverse the action of the TAB key, typically moving the cursor or focus backward in a dialog box or form.

Indent

The space added to the beginning of a line of text; used to separate paragraphs or to nest content in documents.

New Line

In text processing, a character or command that moves the cursor or printing point to the beginning of the next line.