How to put right sidebar on the very right?

You could add some custom CSS that gives the content wrapper a 100% width instead of a fixed width of 1175px.

You could try adding this to your custom CSS:

.wrap {
    max-width: 100%;
}

This would turn the theme into a fluid-layout theme that stretches to fit the width of the browser window, meaning that the right sidebar would be displayed completely at the right of the browser.

Don’t edit the theme files directly, otherwise your changes will be overwritten when the theme is updated.

An easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.

As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.

I’ve found a theme that better suits my needs, besides this edit makes the left sidebar extremely wide.

Nontheless, thank you for responce, this topic can be marked as resolved.

I’ve found a theme that better suits my needs,

Thanks for letting me know. In future, please feel free to update the thread if that happens to let folks know you no longer need help – it saves everyone’s time. ??

besides this edit makes the left sidebar extremely wide.

The right sidebar could always be reduced in width with another bit of simple CSS.