tabs and spaces

Why??

It's pretty much the standard approach to indentation to use tabs. Most people who come along after you and need to maintain your code are probably not going to sing your praises if you use spaces for your indentation.

However... to answer your question... go into the preferences (Window menu I think... I don't have CFB in front of me) and type "indent" into the filter box. It'll point you to the correct screen to make the setting change.

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Adam