One editor tab vs many

win7 32bit, VSCode 1.70.3, PlatformIO 6.1.11.

This is probably a VSCode question, but…

I was experimenting with "outline: in explorer and clicked something that added a line at the top of the editor window telling me what file I was editing.

Previously, when I selected a file, it would open in a separate tab. I might have 4 or 5 tabs open each with unsaveed files.

Now, only one editor tab opens, and when I select a file (in explorer,) it replaces the file and only one tab is used.

How do I go back to the default action?

Thanks, Mark.