Microsoft will start blocking ActiveX by default in Microsoft 365, Office 2024 in April 2025.
https://www.bleepingcomputer.com/news/microsoft/microsoft-blocks-activex-by-default-in-microsoft-365-office-2024/
​Microsoft says those who want to enable ActiveX controls can do so via the Trust Center by going through the following steps (it's important to note that this will enable ActiveX across all Office apps, including Word, PowerPoint, Excel, and Visio):
- Select File, then Options.
- Select Trust Center, then the Trust Center Settings button.
- Select ActiveX Settings, then ensure "Prompt me before enabling all controls with minimal restrictions" is enabled.
- Select OK, then OK again to save your settings and return to your document.
"For optimal security, Microsoft strongly encourages leaving ActiveX controls disabled unless absolutely necessary," Microsoft cautioned.