The appearance pane is all about the visual behavior of QuickLens.
Use the Advanced pane for more control over the Dock and Menubar appearance, notifications and such.
Configure the global hotkeys for launching the tools from anywhere on your desktop. These have been given some defaults for you to get started.
If you ever want to know what version you are running on, or want to chat on the Discord channel, this is the pane that can take you there :-).