how to delete the record in Grab application

Hello,everyone.

I have a problem to clean the record of Grab application.

This is very easy to capture what I want, but the records are still left in the computer.(as the picture)

We can clean the records in any other applications, such as preview, but we cannot find an option in Grab.

How can I clean these records?

If anybody knows, please let me know.

Thanks.