You can highlight bits of code so that an explain plan is run on only that code, or so that you can see what Toad is including as a part of the statement before you Execute it. Highlighting code uses the same logic as SHIFT+F9.
To highlight a SQL Snippet
Place your cursor in the code you want to highlight and then press CTRL+H.
Code folding lets you collapse portions of your code so that you can see more of the code you need to see. Then you can expand it when you need to work with the folded code.
To enable code folding
From View | Toad Options | Editor | Behavior, select Enabled under Folding.
To fold and unfold code selection
The folding indicator is the icon in the code gutter that you click. By default, it is as follows:
To fold a segment, click
To unfold a segment, click 
To set the appearance of the fold indicator
To change the style of the fold indicator, go to View | Toad Options | Editor | Behavior, then select from the Style dropdown.
To change the colors of the fold indicator, go to View | Toad Options | Editor | Font and Styling, then select Fold Indicator (appearance when a code block is expanded or Fold Indicator, Active (appearance when a code block is folded).
Capitalization Effects that you have set up in the Toad Options can override your Upper Case and Lower Case conversions.
To change the selection to Upper Case
Select Edit | Upper Case (CTRL+U).
To change the selection to Lower Case
Select Edit | Lower Case (CTRL+L).
To change the selection to Lower Case
Select Edit | Initial Caps (CTRL+L).
Note: The Editor provides one level of Undo for any action. Select Undo from the Edit menu, or use the CTRL+Z keystroke combination.
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