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By default your portfolio is the homepage but you can set any page as homepage, even a project. To change your homepage go to the 'pages' tab in Paspartout:
The pink button with the little white house inside indicates the homepage. To change the homepage just click on the house on another page. The change will be applied instantly.
Project as homepage
Alternatively you can set a project as homepage. Click ons the slightly smaller house icon on your portfolio page and a sub-menu will appear:
Select a project from the dropdown menu. As soon as you have selected the project the changes will be applied.