As the pictures shown, I want to make the "Grid view" as the default checked. Where should I configure the default value? How?
Up above where you define your field name is a default value textbox. Set the value in the textbox to one of the text options in your "list of options". Since you do not have semi-colon separated lines, your text is your value. In your case you can set the Default value = "Gird view" (you spelled it wrong in your list of options box).
If you have a listing with a semi-colon separated line of value and text it might look like this:
grid;Grid view
list;List view
row;Row view
Then you might use "grid" as your default value.