Hello,

1. Just go to Elated / Theme Options >> Portfolio >> and then enter some unique portfolio slug. 

All custom post types require additional slugs like /portfolio-item/ or /job/ or /listing/.

Custom post types need do be read differently by WordPress than default post type such as blog, because you couldn't have the same name for blog post and portfolio post.

You can, however, change the these slugs to something else, you can usually do that through theme options.
Theme Options > Portfolio or Dashboard > Settings > Permalinks.

Please note that these need to be unique, and there is no way to remove prefix completely, because of reasons mentioned above, you may only change it to your desire.

2. You can disable/enable Title for any created page. Just go to alter some existing page >> and then navigate to Elated Title page settings. There you can disable it.

Please let us know if there is anything else we can do for you.

Thank you,
Jerry

Hello,

Please note that portfolio categories use archive layout. 

This is how WordPress taxonomy works. The Archive ( category ) pages use the same page layout.

You can try to add this css underneath in Appearance >> Customize >> Additional CSS field:

.tax-portfolio-category .eltdf-title-holder .eltdf-title-wrapper .eltdf-page-title {
    font-size:0;
}
.tax-portfolio-category .eltdf-title-holder .eltdf-title-wrapper .eltdf-page-title:before {
    display: block;
    content: 'Products';
    font-size: 60px;
}

Please let us know if there is anything else we can do for you.

Thank you,
Jerry