New to TLB - Trying to Replace Quick Launch Bar

The menu with double arrows have a limited functionality. It is impossible to change the icon size.

I recommend to create the normal menu and move there all shortcuts. If you have too many shortcuts you can use Windows Explorer or any other file manager. The folder where the shortcuts are located is %appdata%\Microsoft\Internet Explorer\Quick Launch. The menus are the subfolders.

Now how to make menu smaller. Set the menu background color and menu items color. This will make menu smaller. Also you can change the option "Menu item margin height" in TLB Settings->Menu->Sizes.