The Group Execute option could be a minimized tab on the left side of the editor window.
If it is not displayed as a panel or tab on the left, go to the Editors menu | Windows and choose "Group Execute".
If the option is still not listed in the menu, right click on the toolbar and choose Customize. Look for the "Editor" and/or "Group Execute" option. When found. Click and drag that from the Customize window and drop into the Editor | Windows menu.