Form creation order

I have a project with a mainform and added a second form (SecondFrm). When i run the project it always showing the last added form (SecondFrm) first. How to adjust the creation order of the forms, so that the mainform is always showing first, regardless of how many forms i add?

In web, it typically only makes sense to have one form to start the application, so turn off auto creation for the other forms.