Hello Erik-
Thanks for the great question, and thanks for using the BoldGrid WordPress website builder.
By default, WordPress determines the excerpt by using the Read More tag that you insert into your post. It looks like this:
However, some themes may manually limit the size of the post excerpt. For example, in BoldGrid’s Crio Theme, you can change this setting in the Customize > Design > Blog > Blog Page > Post List Settings menu.
Since you’re using a commercial theme, Betheme, I can’t say for sure how you can manage your excerpt settings, but their documentation does say that you can adjust it.