To export layouts with filters, go to the View menu > Layout > Open. Then choose the layout that you want to export, and open that layout. Then go to the Filters dialog box, select the filters that are active, and click on the 'Copy as Layout' button at the bottom right of the Filters dialog box. A copy of the filter will be made to the Layout Filters section within the Filters dialog box.
Next, save the layout (View menu > Layout > Save). Then, go to the View menu > Layout > Open. Choose the layout and click on 'Export'. The layout will be saved as a Primavera Layout File (.plf). The filters will be included in the layout file.
You can also refer to Article ID 906320.1 and ID 903492.1 in the KnowledgeBase.
Hope this helps!