Sidebar on pages

Hi there,
Is there a simple way to show to sidebar on all pages (not just posts) through options? Or I have to midify the theme for that? Thank you!

Hello there,

I hope you are doing well today.

That would have to be modified by the theme or you can try using a third party plugin:
https://wordpress.org/plugins/custom-sidebars/
https://wordpress.org/plugins/easy-custom-sidebars/
https://wordpress.org/plugins/simple-page-sidebars/

Best Regards,
Support