By default, when you create a new dub, our latest Dubbing v2 model will be used. Dubs created using the v2 model are completely automatic without any option to edit the content.
If you want to use Dubbing Studio, you can do this by selecting Use legacy v1 Dubbing model in the Advanced options when you create your dub, then check the Create Dubbing project option.
It's not possible to convert an existing automatic dub to a Dubbing project.
The new dubbing project will appear at the top of your list of dubbing projects, and will go through various stages while generating.
Once it has completed processing, click the three dots icon and select Edit to open your dubbing project.
For more information about Dubbing Studio, please see our overview.