This menu items allows the displaying of spaces, tabs and new line characters as visible characters on the screen. It does not change the document but allows you to clearly distinguish between the different characters.
Spaces are shown as: ' ·'
Tabs are shown as: ' »'
New lines are shown as: ' ¶'
If there is not enough room to show the ' »' with the tab, the tab will appear as normal, and non visible.