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App Switcher > Portals > New Portal / Edit Portal > Landing Page > Custom
Optimal dimensions for your background image
When parallax effect enabled: 1800 x 1200 pixels
When parallax effect disabled: 1800 x 500 pixels
For more information about to insert the background image, please check How to edit the background
Thumbnail dimensions for your section layouts
Depending on the layout you choose when setting up your custom landing page, folder/album thumbnails have different pixel dimensions. The below lists the exact pixel dimension of each layout option.