Menu Selection allows you to select which menu type you would like to use for the main menu of your theme. *There are two choices:
Depending on what your selection, this will affect what section appears next in
Main Menu Settings. The default for Menu Selection is
"Top-Bar", this is why the
"Top-Bar Settings" section is visible just underneath it.
If you select
"Top-Bar Settings" section will disappear and the
"Off-Canvas Settings" section will appear.
Each one of these sections has different settings. You can view the settings for each menu type: