Sidebar Settings

You can set the blog main sidebar options using WordPress Customizer. Select Appearance>Customize>Sidebar Settings.

You can select where the main sidebar is going to be displayed (Left or Right) or if there is going to be a sidebar on your blog.
You can have different settings for Home Page, Archive/Categories Page, Single Posts, Pages and Search Results.

These settings don’t affect the Hidden Sidebar.

Individual Post and Page Sidebar Settings.

You can override the default posts and pages sidebar settings from Customizer by using templates on individual posts or pages.
Select the sidebar template you like and update the post/page.

Hidden SideBar

Navigate to Appearance > Widgets to add or remove widgets. If Hidden sidebar doesn’t contain any widgets it won’t be displayed.

The hidden sidebar will not be displayed on devices with Width less the 767 px.