Margins problem

My problem is that I would like the header as well as the cover widget to be displayed in the full width of the screen. Currently, both widgets have margins on both sides, although in the block settings all options are set to zero. The only option that has changed parameters is padding the cover to the left. Similarly, in the block alignment options, setting ‘increased width’ or ‘full width’ does not change anything. Let me just mention that in the beta editor both blocks are displayed across the entire width of the screen on a computer, tablet and phone. To be honest, in my opinion it’s a trivial problem but I can’t find any solution on the internet ??
Thank you in advance for your help.

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