private void saveActiveArrows() {

		if (!activeArrows.isEmpty()) {
			resetActiveArrows();
			return; // don't overwrite existing values
		}

		if (currentAddr == null) {
			return;
		}

		for (FlowArrow arrow : flowArrows) {
			if (currentAddr.equals(arrow.start)) {
				arrow.active = true;
				activeArrows.add(arrow);
			}
		}

		if (activeArrows.isEmpty()) {
			return;
		}
	}
Those arrows that start at the current address
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/flowarrow/FlowArrowPlugin.java