To setup Top Header Options for this theme, please go to Appearance->Customize->Theme Options->Layout Options:
Enable Sticky Sidebar: This option allows you to enable/disable sticky sidebar.
Global Layout: This option allows you to select layout. ( Left Sidebar/ Right Sidebar or No Sidebar). This option will be overridden by other sidebar related feature.
Excerpt Length: This option allows you to modify the excerpt length for blog post.
Read More : This option allows you to change the readmore text.