The selected file in the file tree uses a hardcoded background color (#2d2c35 in pkg/ui/common/styles.go). On most dark terminal themes this is nearly invisible — it barely reads as different from unselected items.

A ui.selectedColor config key would let users match it to their theme:

ui:
  selectedColor: "#1e6ab5"

The implementation is small: thread the hex string from UIConfig into common.Colors at startup in filetree.go's updateStyles().

Screenshot

How it could be configured to look as an example: