Hi there!
Thanks for contacting us.
It requests code cutomization. Here is custom CSS that can provide what you want a bit:
body.com-spsimpleportfolio.view-item.itemid-261 .sp-simpleportfolio-view-item .col-md-8 {
width: 100% !important;
}
body.com-spsimpleportfolio.view-item.itemid-261 .portfolio-right-area {
display: none;
}
But it will remove right area for all the portfolio details pages.
Note: Path towards custom CSS(Joomla 4): System>Site Templates Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.
https://prnt.sc/5mBuSRh907N3
https://prnt.sc/ooiq-lkMEXr_
https://prnt.sc/nunlX-f5AhK1
Best Regards