I'm an absolute beginner in Blender. Now I've accidentally pressed Ctrl+G in Object Mode, the selection color turned into Green selection. How could I make it back to Yellow / Orange color please?

I've been through this Blender Hotkey Wiki: https://en.wikibooks.org/wiki/Blender_3D:_HotKeys/3D_View/Object_Mode
It says here: Ctrl+G is brings up menu for performing group operations on selected objects.

But I din't saw any menu comes out?
Any helpful answer would be appreciated. Thanks.

I'm an absolute beginner in Blender. Now I've accidentally pressed Ctrl+G in Object Mode, the selection color turned into Green selection. How could I make it back to Yellow / Orange color please?

I've been through this Blender Hotkey Wiki: https://en.wikibooks.org/wiki/Blender_3D:_HotKeys/3D_View/Object_Mode and it says here:

Ctrl+G brings up menu for performing group operations on selected objects.

But I din't see any menu. Any helpful answer would be appreciated. Thanks.