Changing editor tab width in eclipse 3.5

Question

I am trying to adjust the width of tabs from Window -> Preferences -> General -> Editors -> Text Editors where there is a field for \"Display Tab Width\". But no matter what

Answer 1

After digging into this more deeply, I think I've figured this out:

Java file tab DISPLAY width

Confusingly, this is under "Formatter" in preferences (like the accepted answer says). But this is inconsistent location-wise with where the option for tab display width for the non-java file Editor is located.

/instance/org.eclipse.jdt.core/org.eclipse.jdt.core.formatter.indentation.size=16

Text file tab DISPLAY width

/instance/org.eclipse.ui.editors/tabWidth=2

---

I emphasize DISPLAY because this is just for rendering in Eclipse. It does not change the contents of your file, and has no effect on "Source -> Format".