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To edit SPFX webpart manifest.json, you can use Visual Studio Code as text editor.

Open the manifest.json under the path ..\src\webparts\webpartname and edit in VS Code Editor:

Update as we discussed：

"if you want a built in web part full width, another workaround would be using Modern Communication Site, this site template is full width by default, so the added OOTB WebPart will also be full width without left navigation."

"For Full Width section, yes, it's only available for specific web parts like hero, image. In this case, you can use One Column, although it's not really full width, but the communcation site have hidden the left navigation. Otherwise, you will need to create custom SPFX Web Part to enable full width."