When coding in Xcode, I double-click a file in the "Groups and files" list, and it opens a new editor window. I have several of these open at once.
Until today.
Today, when I double-click a file in the list, it opens the file in the last editor window I was using, meaning I can only have one editor window up at any one time.
I guess I've switched some option somewhere by mistake. How do I get it back to the way I like it?
I'm using Xcode 3.2.5
Option + Shift + Click on the file in the project navigator. In the popup that appears, the leftmost choice is "Open in a new window".
Xcode 10 and earlier. Simply click on the button in the top right corner with two overlapping circles to access it or navigate to View/Assistant Editor/Show Assistant editor ( ⌥⌘^↩ ).
Using External Text Editors with XcodeChoose Xcode > Preferences to open Xcode's preferences window. There is a toolbar at the top of the window with many buttons. Click the File Types button. From here you can assign the editor to use for lots of file types.
Cmd + T opens a tab next the active one.
In the top right of the editing window is an icon that says "grouped", perhaps you clicked on it by accident.
Click on it so it says "ungrouped", and you'll be back to opening multiple windows.
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