Hello and thanks for your reply.
The functionality of the “Continue Reading…” is built into WordPress. With BoldGrid installed, there is no need to change how you would use this feature. It’s worth noting that this will only work if you have “Your homepage displays — Your latest posts” enabled in the Customizer (Homepage Settings). If you are experiencing issues with implementing it in other areas, you may consider using a plugin to expand the functionality.
I hope this helps!
Sincerely,
Carlos D.