blank side bar impossible to remove or fill with widget

Hi, I added the plugin woo commerce to my site, optimizer theme, and on the shop page, there is an empty left sidebar, and when I tried to fill it with a custom sidebar plugin or widget for exemple, nothing appear on this specific page while on the single product page the widget appear. Then I tried to add the custom code css :
.archive.woocommerce .content-area {
width: 100% !important;
}
And the row show now 4 product and no more just 3, but the right padding has totally disappear.

So my questions is :
– How can I fix the padding ?
– how can I remove this blank space ? and if I cannot, how can I fill it with an widget ?

Thanks so much in advance,

https://www.ads-software.com/plugins/woocommerce/