See attached. My face is cut off, how do I fix this?
You can adjust slider height by using the custom plugin solution shared in the following topic.
https://colorlibsupport.com/t/increase-slider-height/#post-66716
Also, with this theme am I able to change the text and font colors?
Yes you can change it by developing custom CSS code and adding it in the Custom CSS option of your theme on the below path.
Admin Area -> Appearance -> Customize -> Activello Options -> Other -> Custom CSS