Scale uniformity

I’m new to UE so please bear with me.
In very simple terms, I want my character to be half as tall or so from the walls surrounding him.
Let’s say I’ve modeled a 300cm tall wall, how do I set up my character to be like 150cm tall or so?

When I drag and drop the default character blueprint into the level, it appears as small as a grain of rice compared to the wall next to it and I don’t want my character to be an ant for that matter.