General options concerning the website layout can be found in the "Layout" tab in the "Theme options" page.
If you need to make specific customizations to the theme appearance, you can use the "Custom frontend CSS" textarea located under the "Appearance" section in the aforementioned tab.
In pages and post-type entries, a box called "Template options" is entitled to manage all the options concerning the appearance of the page or post.
Custom sidebars can be created from the "Theme options > Sidebars" section
Sidebars are actually not available on the "Page full width" page template, 404 page, and the WooCommerce single product page.
If you want to use widget areas in the footer portion of the theme, you can select the columns layout for the footer area, in the "Footer" section of the "Layout" tab.
Selecting none will disable the footer area entirely, while selecting a column configuration will automatically create a new Widget Area named "Footer column #", which you’ll can populate under the
Appearance > Widgets section of the WordPress administration.
The theme has been designed to adapt itself to various screen sizes, like the ones used by tablets and phones. In order to get the most out of the theme even on these kind of devices, make sure to enable the appropriate responsive feature, in the "Responsive" section of the "Layout" tab.