Hello @ashima02,
To make your pages full width without a sidebar you will need to go to your Admin Dashboard > Appearance > Customize > Theme Options > Layout Options > Global Layout and select the “No Sidebar” option.Save your changes and the layout will apply to all your pages.
You can also override this setting to make desired page full width or have sidebar in either side. For this, under page edit screen below the default content editor, you can find the “Theme Settings” metabox that lets you “Choose Layout” of specific layout for the page you are currently editing.
Hope this helps you,
Best Regards !!