I am using the “marketer” generatepress theme. When working on the site layout i found out that using a custom excerpt removes the “read more” button. The solution to this was to have a child theme with the following in functions.php:
However, after applying this, my posts featured images are now showing full size instead of the scaled down 300px width it was before. No matter what I select for “left, right, or centered” it shows the fullsize image and then the excerpt below it.