I added the code but now the image is NOT showing.

I’m using the “Gallery slide” portfolio layout that has the “custom fields” to the right of the description.

Does it display after removing the above custom CSS code?

If yes then just use the following custom CSS code and i will provide you code for resizing image.

.single-fw-portfolio  .sh-portfolio-single-buttons {
    display: none;
}

One last thing, I don’t see the option to add a manual excerpt for each project.

The project custom post type doesn’t support manual excerpt.