How to set up grid or tiles layout?
The process of setting up grid or tiles layout is as follows:
1. Create a static page.
2. At the bottom of page edit form choose desired Page Type (Tile Grid, Grid or Wide Grid). You do not need any content.
3. Publish a Page.
4. In Settings > Reading choose A static page and select the newly created page.
The home page of your blog should display the desired layout type.