I can't change the Page attributes to full width screen

Hi, I have yet another problem, I want to modernise my home screen by getting rid of the slider and making it full width screen and perhaps adding a video. I have tried to change it in page attributes but nothing happens. There is also a darker background blue behind the small images which I can’t get rid of unless I deactivate the styles plug in. I have gone through all the settings and I can’t fix either problem. can you please help me. many thanks

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