This post in not about the default task mode in Project Professional. Here is a Guillarme’s tip about that. When you just start with scheduling in PWA Schedule web part, you will see that the tasks by default are created in the Manually Scheduled  mode. While this can be changed, just by clicking the Auto Schedule mode button, it is another step your team members may miss or plain ignore.

This can be changed, so that all new projects will be started in the Auto Schedule mode. Here are the quick steps.

Navigate to Server Settings >> Additional Server Settings

On the Additional Server Settings page, scroll to find, Task Mode Settings  and select the option for Default task mode for new projects to be Automatically Scheduled. Then click Save.

Now, whenever you create a new project, the tasks will be set as Automatically Scheduled as default.

Note: This does not change the default task mode for existing projects.

Now how would you change existing projects behavior for new tasks?

Open the project in Project Professional, and navigate to File >> Options >> Schedule

For the options New Tasks created, change the mode to Auto Scheduled, and click OK. And then publish the project and check it in.

So, next time when you edit the project in PWA (or Project Pro), the tasks will be created as Auto Scheduled.