March 27, 2013, 11:42 AM — Here's how you can adjust the size of tiles in Windows 8.
1. Right-click a tile.
2. Choose smaller or larger, depending on the current size of the tile.
Note that there are only two sizes for tiles, and that some tiles cannot be changed.
For more, see the original article at the link below.
HDG Guide to Customizing and Organizing the Windows 8 Start Screen | Help Desk Geek