private void forgetProject(ProjectLocator projectLocator) {
		if (projectLocator == null) {
			return;
		}
		if (projectLocator.equals(lastOpenedProject)) {
			lastOpenedProject = null;
		}
		recentlyOpenedProjectsList.remove(projectLocator);
		updatePreferences();
	}
Remove the specified project from the list of known projects.
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/DefaultProjectManager.java