I am trying to make three column page layout and I want middle column to be bigger than other two. How it is possible.
Do we have to add anything into spfx web part or is there other way !!
According to my research, there is currently no OOTB method to modify the height and width of the column.
Here's a user voice that's been proposed:
Allow changing the width of columns when adding sections to a Modern Page
If you are in desperate need of this requirement, you can write custom CSS in modern pages, which is not a good suggestion.
https://github.com/SharePoint/sp-dev-fx-webparts/tree/master/samples/react-script-editor
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