Upgrading to 9.0 does not migrate font settings. How to change font format in Toad for Oracle 9.0?
Due to the new single Editor, Toad stores font settings for each individual language. The font settings from previous Toad for Oracle versions will not carry over to version 9.0.
1. Go to View | Options | Editor | Behavior
2. On the right side, under "Language" select what language you're working in. (For SQL select PL/SQL)
3. Click Edit
4. Click the Highlighting tab.
5. Change the fonts to your liking, select Apply and Save.