Check the 'Snippets'-checkbox to display meta information in the preview pane (although you can control this behaviour as well using its respective shortcut Cmd/Ctrl+Alt+S). The 'Night Mode' is simply the dark theme Zettlr is capable of (and which you might want to control using the shortcut Cmd/Ctrl+Alt+L instead). The 'Night Mode' and 'Snippets'-checkboxes control the display. The application language is pretty self-explanatory. In the general tab you find options that you might want to adjust if you begin using Zettlr to fit it to your needs.

Advanced: Options for experienced users.Display: Control how the editor displays certain elements, such as images or links.Zettelkasten: Adapt Zettlr to match your Zettelkasten system.Export: Control how your files are exported in this tab.Editor: These settings concern only the editor itself.General: These options affect Zettlr as a whole.They are ordered in six tabs that you can see at the top of the dialog. The dialog will then show up and present to you all configuration options you may customise.

You can display the general preference dialog using either the shortcut Cmd/Ctrl+, the toolbar button (the cog) or the respective menu item. It comes with three different settings-dialogs that will be explained in detail here, so you know which option does what. Zettlr offers you a plethora of options to customise your experience with the app.

Id generate zettlr