A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear respected nerdyplayer1,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem but based on your description we can work together to resolve it.
For the situation you encountered, we deeply understand the inconvenience caused and apologize for it.
As per your description, to resize webpart in a SharePoint online modern UI site page, I'm Sorry and I'm afraid currently, there is a limitation on which out of the box web parts can be displayed within full width sections, however, SharePoint Framework (SPFx) solutions can be configured to support full width display by setting the supportsFullBleed property to true (as like mentioned in your Microsoft official article).
In this scenario, you need to add the Script Editor web part to the full-width section.
As our forum focus on how to deal with the out-of-box issue of SharePoint, we are really sorry for couldn't provide a better suggestion for you. If you need further assistance on using SharePoint Framework (SPFx) solutions, we sincerely recommend you raise questions in Microsoft Q&A – SharePoint Online. Questions about programming, development, which is the specific channel to handle such situation. You may use sharepoint-dev tag and office-sharepoint-online tag when" Ask a question". The engineers in related team will focus on your specific scenario and provide specific suggestions.
We appreciate your understanding that sometimes the initial suggestions may not resolve the problem very soon. However, we can work together to narrow down and resolve the situation.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad