I just installed Avidemux 2.6.4.

I have an mp4 video that plays at the wrong speed on my TV, and Avidemux's "rebuild frames" often fixes glitches like that.
But the latest version doesn't have anything in its "Tools" menu except "Scripting shell"

Is there a rebuild frames in this, or do I have to go back to an old version?
Why would this function be removed?