Hi Jiyong

Thanks for posting in the Community! Unfortunately what you are trying to do is not currently supported in Lucidchart. However we're always looking for ways to improve Lucidchart and your feedback is the best way for us to do that. Would you mind adding your idea to our Product Feedback section? Ideas submitted are passed on to the product development team for their consideration.

As a growing company we take our feature requests very seriously. We are continuously looking for how we can make our product more useful and effective for our users and we pass that information directly to our product development team.

Thanks for your request and I apologize for any inconvenience this causes you.