Lifter LMS provides its own fully functional membership component and Reign provides amazing option to style membership listing page what more you are looking for simply navigate to Dashboard >> Appearance >> Customize >> LLMS Membership >> Archive
You will find the following options here:
Layout – Allows you to choose a layout for all archive pages.
Enable Header Image – Allows you to enable/disable header image.
Blog Header Image – Allows you to set page header image for blog page.
Left Sidebar – Allows you to set left sidebar.
Right Sidebar – Allows you to set right sidebar.