'width widgets for wordpress elementor

I am new to website creation and I am currently creating a website for my son who is going to open his business in France. This website is currently hosted locally by WampServer and I use Wordpress, Elementor and the AERA theme to design it. I have a side widget area that I would like to reduce in order to leave more space for the body of the site. I don't know how to do it. I suppose that a CSS could help me but as I explained to you, I am a novice. Could you help me? I will add screenshot to help understand. I would also like the widget side area (where the buttons are) to be able to drop down as the person scrolls. Thanks for your help.

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