template FORTE - increase size embedded virtual art space

Site URL: https://www.galeriejamar.be

Hello, I made this website for an art gallery. But have a question on clients behalf. He wants to get the art spaces bigger on the screen. I used the FORTE template and made a new page for every pending exhibition to keep it clean. By editing page content I embedded a code. Question: can I change width of the art space visualisation? I can change the height in the embedded code but width is maximum template is giving me. Can I change this ? Just for the exhibitions pages, others are OK. Hope to hear you. Best regards, stay safe.