I tried to install the Portfolio template (NOT the quick-start) on a Joomla 4.1.5.
Installation ok.
Then I added to the menu: Category Blog.
On the front page, I get the error:
Notice: Undefined property: Joomla\Component\Content\Site\View\Category\HtmlView::$columns in xxxxxxxxxl/webtest/templates/gk_portfolio/html/com_content/category/blog.php on line 67
I tried to install the Portfolio template (NOT the quick-start) on a Joomla 4.1.5. Installation ok. Then I added to the menu: Category Blog. On the front page, I get the error: Notice: Undefined property: Joomla\Component\Content\Site\View\Category\HtmlView::$columns in xxxxxxxxxl/webtest/templates/gk_portfolio/html/com_content/category/blog.php on line 67