Press the home icon in the the bottom left corner of your app to access the photo feed. On top of the feed you'll see a banner with different display settings:

Feed view

By pressing the feed icon represented by two horizontal lines  you can scroll through all posts individually.

This is the standard view and is great for taking a closer look at all the amazing details in each photo.

Grid view

By pressing the grid icon  you can view several images at once in a grid-like overview. Click on any image to enhance it so you can take a closer look, like it or share it.

This view is great if you're searching for specific images.

To view all the posts in your browser, click on Gallery in the side menu.

On the following page you can click on the filter- icon and you will see several filter options to choose from.