Change the text options

In Options menu click Text. Text options dialog will be showed

Select appropriate options. Press Ok button. The default values can be selected using Defaults button. The options will be persisted after the program quitting

Here is several options :

Tab size
Change the tab size for edited text. By default is 4
Margin
Change margin of text component
Auto indent mode
Set auto indent mode for text component. In this mode the new line will be started with beginning white spaces as previous line
Line wrap
Set line wrap. In this mode the line will be visually divided in two when is bigger then window size
Wrap style
Wrap style options enabled if line wrap is turned on. Two wrap style options is available: character and word. Character wrap style set line wrapping by character. Word wrap style set line wrapping by word.