Found under the "Products" tab, the "Global Settings" category allows you to set the following general options:
Set SKU number generation to Automatic or Manual.
Manual SKU number generation requires
you to enter your own SKU number for each product. The automatic setting
will generate these numbers for you.
Set default product image sizes.
By default, the image sizes
are set to 60x60 pixels for thumbnails, and 200x200 pixels for full-size
images. You can change these default settings as desired; however, the
settings you use will apply globally to all product images. You cannot
set different image sizes for each product in your store. Whatever you
set your image dimensions to, all images you use for products will be
scaled to these dimensions. E.g., if you set your thumbnail image size
to 100x100 pixels, and use an image which is 105x123 pixels, it will be
resized to 100x100 pixels.
Main Product Page Order.
If you have products displayed
on your main store page, you can set the order in which these products
are displayed.
When you are finished modifying global settings, click "Apply" to save your changes or "Cancel" to abort any changes you have made.