Hey Tamer,
There is no option to position the Dropdown. The only way to push the Dropdown down is to increase the size of the Toggle.
Regarding making it fullscreen, that is not possible. I’d recommend you use the Modal element instead to cover the screen with the menu when clicked.
If you wish to continue making the Dropdown fullscreen, that would require element modification using custom CSS. That is not covered as part of our product support.
If you want to receive customization guidance, please subscribe to our One Premium Support.
Thanks.