Turn on Visualize Spaces in the Options menu or click the corresponding button on the collection toolbar if you want spaces and tabs to be visualized. Spaces are indicated by a vertically centered dot. Tabs are indicated by a » character. This option is useful when working with clips where extraneous whitespace can lead to problems, or where the difference between tabs and spaces matters.
To change the color of spaces and tabs, customize the color palette and change the “Editor: Whitespace” color. Its text color is only applied to visualized spaces and tabs. But its background color is applied to spaces and tabs whether they are visualized or not. So if you set a background color other than “default” for the “Editor: Whitespace” color then spaces and tabs appear as colored rectangles, with or without their symbol.
The Visualize Spaces button on the collection toolbar has a drop-down menu with several related items:
Convert|Tabs|Tabs ⇒ Spaces
Convert|Tabs|Spaces ⇒ Tabs
Convert|Tabs|Indentation Spaces ⇒ Tabs
Visualize Spaces
Visualize Line Breaks
Selecting the Visualize Spaces item in the drop-down menu has the same effect as clicking the Visualize Spaces button directly.