Yes, it's possible to remove the "categories" from the URL structure in the processblog module. Here's how you can do it:
In the ProcessBlog module configuration, go to the "Categories" tab.
Edit the "Template for category URLs" field by replacing "categories/" with an empty string. For example, if the current value is:
/mysite/categories/{slug}/
change it to:
/mysite/{slug}/
Save the changes.
Next, edit the "Template for post URLs" field by adding "{category}/" before the "{slug}" placeholder. For example, if the current value is:
/mysite/{slug}/
change it to:
/mysite/{category}/{slug}/
Save the changes.
Finally, regenerate the URLs for all your posts and categories by going to the "Tools" tab and clicking on the "Regenerate URLs" button.
After completing these steps, your category URLs will be in the format "/mysite/example-categories/" and your post URLs will be in the format "/mysite/example-categories/example-post/". The "categories" part of the URL will be removed.