The tools in the Area Highlighter toolbox are used to place colored highlights in the markup file. These tools use the settings of the Place Block tool. To display this toolbox, in the default setup of the Tasks dialog, go to the Redline task in the Markup workflow. Right-click on the area highligher tools (fifth row down) and select Open “Area Highligher” as Toolbox.

All tools in a toolbox are not always visible by default. To see all tools, right-click in the toolbox and select Show All from the menu.