How do I disable tabs in Visual Studio Code?

Visual Studio Code v1.27+ now includes a GUI for editing settings:

1. Open menu File → Preferences → Settings.
2. Choose User Settings to apply everywhere (or Workspace Settings to turn off tabs on just this workspace).
3. Choose Workbench → Editor Management on the left, and then scroll down to Show Tabs and uncheck.

Alternatively, you could just pop into Zen Mode, which has tabs hidden by default.

Editor Tabs make their appearance starting with Visual Studio Code version 1.3 (June 2016) and are enabled by default. To disable editor tabs:

1. Open Visual Studio Code User Settings (Preferences → User Settings). This will open two side-by-side documents.
2. Add a new "workbench.editor.showTabs": false, entry (if this is the last entry, omit the trailing comma).
3. Save the User Settings file.