Grid View menu

The GridView menu controls the right-hand area of the screen, where the thumbnail images are displayed. Tree & Grid View
Show file names If Show file names is checked, the file name is shown, as at the left. If not, the file name is not shown. Don't show file names
Fill full cell If Fill full cell is checked, small images are magnified to fill the cell.If not, small images are shown at their original small size, as at the right. Don't fill full cell
Use preview

If Use preview/icon first if available is checked, the preview or icon appears on the screen before the thumbnail is drawn, as at the left. If not, only the image's title is shown, as at the right.

The preview or icon is the same as what shows in the Finder. Depending on the application that originally create the image, previews or icons may or may not be available.

Don't use preview

Set Orientation of all allows you to rotate all the images at once.

Lock Cell Size if checked, disallows changing the cell size. It can be overruled if you depress the Control Key as you move the mouse over the image.

Cell Size & margin brings up a dialog box which gives you control over the thumbnail display.

Default cell size redraws the thumbnails at the size specified under Grid View's Preferences.

You can scroll in various ways in GridView. The PageDown key or the Spacebar scroll the display down a page; PageUp or Shift-Space scroll it up a page. The Arrow keys select adjacent cells; if Option is depressed at the same time, they scroll the display slowly, and the Home and End keys are also active.

NOTE:
You can set permanent controls for many of GridView's characteristics using GridView's Preferences.