Where are the buttons?

[Newrone]

In recent versions of Avidemux, most of the function buttons are missing compared to 2.6.6.
How do I preview the Output version?

(Menu views attached. I can't seem to display them inline here.)

[Jan Gruuthuse]

right hand bottom corner of avidemux worksurface under A and B time indicators:

[v] Play filtered

enable (preview) or disable (source video)

Avidemux 2.6.branch has been simplified unified (developers prerogative) some time ago.