By default, why is the input method period a solid point instead of a hole?

The default is English punctuation. On the far right side of the input method, there is a key similar to a keyboard, next to which is the switching punctuation. Click it and it will become Chinese punctuation, and to the left, it will be a full angle and a half. When you enter numbers, you can see the difference. You also need this when making static web pages.