Yes you can make the Banner Slider full width but you will get only single post per slide rather than grid column design.
Please follow the below step to hide Featured Posts from banner.
1: ‘Appearance > Customize > Banner > Featured Post 1’ and check ‘ON’ the option ‘Hide Featured posts 1’.
1: ‘Appearance > Customize > Banner > Featured Post 2’ and check ‘ON’ the option ‘Hide Featured posts 2’.
Now you will have the Full Width Banner.
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