Hi Anthony

Thanks for posting in the Community!

In order to be able to Generate Google Slides from your Lucidchart document there need to be presentation slides in your Lucidchart document. If there are no slides in your document the "Generate Google Slides" menu item will be greyed out. For more information on how to add slides to your document please take a look at the Create a Presentation in Lucidchart article in our Help Center. 

Let me know if you have any additional questions and hope this helps!