Understanding how macros work in Excel 1. Understanding how macros work in Excel Macros are automated scripts that allow you to perform repetitive tasks in Excel. For security reasons, Excel disables macros by default when you open a file, especially if it comes from an external source. This behavior is designed to protect the user from malicious macros. 2. Identifying the source of the problem If Excel disables your macros every time you start Excel, it likely means that your file is not in a "trusted" location or that your macro security settings are too restrictive. Therefore, it is essential to check the security settings in the Trust Center. 3. Accessing the Trust Center Open Excel, then go to File > Options > Trust Center > Trust Center Settings. This is where you can manage settings related to macro security and trusted locations.