Go to the menu Edit > Preferences. This panel contains some settings for Presets.
Preset Directory and User Preset Directory
Choose or Open the location where the Presets and User Presets are stored on disk.
Preset Thumbnail Size
Choose the size of thumbnail to displayed in the Presets panel. Choose from Standard, Large, and Extra Large
Standard, Large, & Extra Large Thumnails
Next: Presets Technical Information