Hello @Chris and welcome to Elfsight Community 
If I understood you correctly, you mean title caption text.
Unfortunately, unfortunately, our widget doesn’t have an option to change the size of the caption text. Please accept my deepest apologies!
I agree that this feature would be really useful and we have such a request in our Wishlist
Please vote for this feature to get a notification upon its release.
If I misunderstood you, could you please specify what caption text you mean?
As for the changing the image height, I’ve forwarded your request to our devs and, hopefully, they’ll come up with a solution really soon.
Please do not worry, we’ll keep you updated 