1. Select View | Options from the main menu of Toad.
2. On the left hand side, select Editor | Behavior.
3. On the right hand side, under Languages, select PL/SQL and hit Edit button.
4. Select Highlighting tab and select the appropriate Category to make the changes.
5. Background color, font style, font color and capitalization effects can be changed.
6. Disable/Enable revokes and invokes the style effect respectively.