Add Key Levels. It is a free official indicator that draws the previous day's high and low as labeled lines. By default it also draws today's open and the previous week's high and low.
- Click Indicators in the top bar, or press
/. - Search for "key levels" and click Add on Key Levels.
- To change what it draws, hover its legend row and click the gear.
Key Levels also works on CME futures charts.
What you can turn on
Each period has its own tab in the settings: Daily, Weekly, Monthly, Quarterly and Yearly.
- Daily: Prev Day High, Prev Day Low and Day Open are on by default. Prev Day Close and Day EQ (the range midpoint) are off.
- Weekly: Prev Week High and Prev Week Low are on. Week Open, Prev Week Close and Week EQ are off.
- Monthly, Quarterly and Yearly stay off until you turn on Show Monthly Levels, Show Quarterly Levels or Show Yearly Levels.
- The General tab holds the label options, such as Show Distance %, which prints how far each level is from the price.
Key Levels has no overnight high and low levels.