Thank you for your reply.
I will edit the file, but I’m having trouble finding the lines of code referenced. I have version 4.8.
Just to compare, my class-fepadmin-settings.php file has 1533 lines.
Line 444 is an empty line, and so is 512 (lots of double line spacing in the code file).
I searched for the instances of wp_kses_post in the file (found 5 total) and found there are 4 in the function called field_output, and 1 in the function called posted_value_sanitize.
Which of these instances should be modified or removed?