If your organization wants to use only simple projects in Precursive but you don't want to set it manually on each newly created project, you can use an org wide custom setting 'Set new project as simple'.
To set simple project as a default value for all your new projects, go to Setup.
Find Custom Settings under Develop option in the App Setup section.
Click on Preempt Global Settings → Manage → Global and then click on the Edit button.
Tick 'Set new project as simple' checkbox and Save.
Now, each time you create a new project, the Simple Project button will be already enabled.