Welcome to the forum.
All "export" operations for outputting AV files from the Timeline, have been moved to the Share Tab. There, you will find just what you are looking for.
The Export setting from the Toolbar is basically now only for Saving a Title as a Template. Seems that there is one more similar operation from there, but for AV file output, just look on the Share Tab. Also note: the options Panel has a scroll bar on the right, so if you do not see what you want initially, use that scroll bar to expose more options.