To do a hanging indent in Google Docs:
In the "Paragraph" window that appears, click on the "Indents and Spacing" tab.
Under the "Indentation" section, set the "Special" dropdown to "Hanging".
Use the "By" field to specify the size of the hanging indent. This is the distance between the left margin and the first line of the paragraph.
Click "OK" to apply the formatting.
Alternatively, you can also use the keyboard shortcut "Ctrl + Shift + T" to quickly apply a hanging indent to the selected text.