I want to change SharePoint online's new design of document library and lists.
i have modified all master pages but didn't get any result.
Is there any way to change this view for all list and libraries?
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At the moment Microsoft does not allow any branding or injecting script in the Modern Experiences.
The only way you can make changes is by using a Browser plugin like Stylish,
but to implement that across a Company requires configuration of every (user) Browser. IE takes some more effort than Chrome or Firefox. As far as I know there is no Extension for Microsoft Edge.
Note: You can change the look and feel when you work on classic mode only, New experrience does not support jquery/css modification. support article.