Hello,
First of all, thank you for using our theme and for contacting us.
The portfolio is a specific page which doesn’t have any content and shows projects automatically, like this https://xstore.8theme.com/portfolio/ , you can rename the page http://prntscr.com/sudb2v , and create the content of projects depends on your needs
( http://prntscr.com/sudbu5 http://prntscr.com/sudc9b http://prntscr.com/sudcjq ) . The page should be selected in Theme Options > Portfolio – http://prntscr.com/sudde7
If this is not what you are looking for, describe the desired result in more detail.
Regards