Thanks for sharing the URL. The line “After Main Content” is actually a placeholder. You can replace this text by put your own text here. However, if you really want to hide this line, you can do it by going to Appearance > Customizer > Additional CSS and add the following line of code in there:
#sidebar-after-main-content .widget-text .textwidget p {
display: none;
}
Remember, the above code will hide any paragraph text (<p>...</p>
) inside <div class="textwidget"></div>
because you have specified all <p> tags to be made hidden in the above code. If you want to put something in there, you need to use different HTML element like <span> or <div>… meaning anything except <p>.
Let me know if this helps to accomplish your goal.
Thank you!