The textures pane displays all the texture resources created up to and including the selected command.

If the texture has a mip-map chain, then you can change the displayed mip-map level with the slider at the bottom. By default level 0 (the highest resolution) level will be displayed.

Placing your mouse cursor over the texture will display a zoomed in preview of the surrounding pixels in the bottom-left hand corner of the view.

To the left of the texture view is a toolbar with the following buttons:

Button Description
Zoom to Fit Click the button to adjust the graphic to fit completely within the Textures pane.
Right-clicking the image is another way to Zoom to Fit.
Zoom to Actual Size Click the button to show the image at no scale, where one device pixel is equivalent to one screen pixel.
Zoom In Click the button to zoom in. You can also use your mouse wheel, or two-finger swipes on a touchpad, to scroll in and out. You can drag the image with your cursor.
Zoom Out Click the button to zoom out. You can also use your mouse wheel, or two-finger swipes on a touchpad, to scroll in and out.
Color Channels Click the button and then select the color channels to render or deselect color channels so they aren't rendered. The options are Red, Green, Blue, and Alpha (transparency).
Background Select the button to display a checkerboard background or solid color.
Flip Vertically Flips the texture vertically.
Accesses / Modifications Select this button to view a list of all calls that updated the texture to this point. Select a call to view the texture after the call completes. The selected frame thumbnail and the Commands pane update accordingly.