Added option to disable each selection visualizer type separately in GUI. You will see state while hovering over button in main menu or by wool color in settings menu. Click wool to change state.
Now you will get messages informing if your selection visualizer mode is disabled while performing appropriate SelectionVisualizer command. Just friendly reminder to enable feature if you have disabled it before.
Now glass panes in main menu will turn red if selection visualizer is disabled by using /sv toggle command. Again this is just to remind you that visualizer for you is disabled and if you want to use it, you will need to enable it.