allout-widgets-auto-activation is a variable defined in `allout-widgets.el'.
Its value is

Activate to enable allout icon graphics wherever allout mode is active.

Also enable `allout-auto-activation' for this to take effect upon
visiting an outline.

When this is set you can disable allout widgets in select files
by setting `allout-widgets-mode-inhibit'

Instead of setting `allout-widgets-auto-activation' you can
explicitly invoke `allout-widgets-mode' in allout buffers where
you want allout widgets operation.

See `allout-widgets-mode' for allout widgets mode features.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.