idea expand a collapsed folder

1. Press键盘中的向右箭头

To expand the selected directory, press the right arrow keypad, which expands when a layer of the current directory. If you want to expand all, has been holding down the right arrow to hold.

2. Press数字键盘中的 *

To expand the selected directory, press the numeric keypad *, this time a layer expands the current directory. If you want to expand all, has been holding down numeric keypad * can hold.