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You are not required to close ArcGIS Pro if you want to open another project. ArcGIS Pro doesn't allow you to open a project if you already have a project open. This will close the current project and open the one you select. To do this, follow these steps.

1. Click the Open button located on the Quick Access Toolbar at the top of the ArcGIS Pro interface, as indicated in the following image:

1. In the Open Project window that appears, navigate to C:\Student\ArcGISProCookbook\Chapter1 using the same method you did to open the current project.

1. Select the Chapter 1 Ex 1A.aprx file and click OK.

The project you originally opened should now be closed and a new project should be open, which looks similar to this:

You have now opened two projects in ArcGIS Pro using two different methods. You will find, while using ArcGIS Pro, that there are usually at least two ways to accomplish any tasks. Often there are more.

1. If you are not continuing to the next recipe, close ArcGIS Pro without saving the project.