Go to Blog posts and click to Add blog post button
Enter information for article (portfolio item in this case) such as title, content, special image
Choose a blog which created in Step 1 and enter tag which will use for filter
Go to Theme Customize > Blogs > Click on the Portfolio categories
A portfolio page will show and you can see the config block in the sidebar
PAGE HEADING will have all options for the area in above
PORTFOLIO will have all options for main portfolio
To enable filter, please use this option and remember, you must enter tags to the portfolio content (see step 2).
If you don't want to show all tags, you can add manually by use MANUALLY BLOCK and add new tag from CONTENT block below (see screenshot).
Hope you success!!