At the moment, any domains created in plesk and sync'd to Digital Ocean get put into the default project/container. There is no way to specify the destination project.

If you then go into Digital Ocean and move the domain to the correct project/container and then go back to plesk and make any dns change and click update, it resyncs to Digital Ocean and moves it back to the default project/container.

This means that Digital Ocean DNS extension for Plesk currently does not support the usage of a project different from Default in DigitalOcean. that makes organizing things harder and it would be really helpful if such a feature gets added to the extension.