The Configuration Encoder Tool can be found via the Options button on Output Settings panel.
This is where each image/movie format has specific settings pertaining to that format; to include codecs (if available).
In the distant past when MOV format was a going concern there were a lot of codecs for the MOV format.
Many of those have faded into obscurity.
Of interest, the MP4 format/container was created on the basis of the MOV format/container.
Clicking on Options for AVI for me crashes OpenToonz... so... buyer beware!
Added: The codecs listed in the dropdown will depend on what codecs you have installed on your operating system.
For instance, I have some Techsmith codecs that came with a program called Camtasia.
The problem with using odd codecs though is that those viewing the video need to also have that codec installed.