The Show options button on the top left of the Package Details can be used to view the Package Store options for Package Store packages. This option is only available for Package Store packages.
Clicking on the button will open the Package options dialog. The dialog is divided into the Package Store options tab and the Advanced Package Store options tab.
In the tabs the options that have been configured for the package will be shown. The options shown depend on the specific package. This dialog is view-only. The Package Store options and the Advanced Package Store options are defined when downloading the package from the Package Store. More information about adding a package from the Package Store can be found here.