What is it:
This VBA Code will help you close all workbooks opened in the system in one go.
How to close all workbooks in one go:
Step 1: Open the macro file or the excel where you want to put the code and press Alt + F11
Step 2: Copy and Paste the below code in the VBA editor window and Save the workbook.
Dim wb As Workbook
For Each wb In Workbooks