These settings can be found by navigating to Appearance → Style Properties.
Enable node styling - This setting allows you to enable node styling or disable it. You must have this enabled to be able to change the color, icons, etc on the nodes.
Image overlay - Choose a color to be set as the overlay over an image.
Enable header styling - If enabled, the node background image, background color, font color will be applied to the titlebar, and sets the node background as an open-graph image for threads and nodes. The options to enable it are:
on forum view
on thread view
on category view
Show icon in header - This will display the icon set in the titlebar of nodes. At least one of the header styling options above must be enabled. The icon can be set by going to ACP → Forums → Node layout and styling → Choosing the node to add an icon → Node icons.
Background selector - This is the selector that should be used to place the background image and color on a node if selected.
Text selector - This is the selector that should be used to place the text color or styling on the node if selected.