Hello @arabisk,
There are 2 ways to set the sidebar for pages/posts.
1. Go to the WP Dashboard > Appearance > Customizer > General Options > General Settings: https://postimg.cc/874XNbYW. Also, you can find the same settings(layouts) for blog and woocommerce in the settings like: https://postimg.cc/ZCX9MkHD.
2. Under the edit page, find the “O” icon, OceanWP Settings > General Options.
For more information, please follow this article: https://docs.oceanwp.org/article/828-general-main-oceanwp-settings.
I hope it helps.
Best Regards
