Hello there,
Greetings for the day.
To get all positions in the middle please disable the sidebar and make the container full-width from your theme settings.
Or alternatively, you can use the below CSS code as well.
.single-wpdmpro .site-content .content-area {
width: 100%;
}
.single-wpdmpro .is-right-sidebar {
display: none !important;
}
Regards