Excel 2013 -当关闭多个工作簿时，如果一个工作簿被隐藏

I've written a program in Excel VBA which uses a UserForm to enter data by the users. Specifically, it is a Telemarketing Tracker tool: the user fills in the details of the call in a text box on the UserForm and then clicks the relevant button to indicate whether it was a good or bad call, and can then continue with the next call. I've written a program in Excel VBA which uses