Multiple editor windows in Xcode

Question

When encoding in Xcode, I double-click the file in the "Groups and Files" list and opens a new editor window. I have several of these discoveries at once.

Up to this day.

Today, when I double-click on a file in the list, it opens the file in the last editor window that I used, that is, I can have only one editor window at any time.

I guess I changed some option somewhere by mistake. How to get him back to the way I like it?

I am using Xcode 3.2.5

Answer 1

In the upper right corner of the editing window there is an icon that says “grouped”, maybe you accidentally clicked on it.

Click on him to say "ungrouped", and you will return to the opening of several windows.

Answer 2

perhaps preferences> General> Open instance in the same editor