I have added an article pin.

Pin Article ID option (Data Source tab)

In content-pro-joomla.yaml a new field was added: Pin Article ID (optional).
It accepts a single article ID (e.g. 1606). Leave it empty for normal ordering.
2. Reorder logic in the particle Twig

In content-pro-joomla.html.twig, after the article list is loaded, the template now:
Reads Pin Article ID (e.g. 1606).
If it’s set and not zero, finds that article in the list and moves it to the first position; the rest keep their relative order.
What you need to do

In Joomla: System → Clear Cache (so the particle YAML is reloaded).
Edit module 445 (“Meltonians Blog”):
Open the Content PRO (Joomla) particle (or the module’s “Data Source” / article options).
Find Pin Article ID and set it to articleID.
Save the module.

Enjoy