Opposite of "Extend Selection?"

I am trying to become more proficient with Mathematica shortcuts.

To avoid using the mouse when folding a section, I am using Extend Selection CTRL+.. I press that key until the whole section is highlighted and then fold the section with CTRL+'. However, when doing so, I often press the key one too many times, also selecting the parent section above.

Is there a command that is the opposite of Extend Selection? I have tried to look through the keyboard shortcuts but could not find it. Thanks.