
we've been using EnterpriseMode (EMIE) to control IE11 on Win7 & Win10 for 6 years now just fine, and now re-using the same for controlling IEMode for Edge, but it doesn't manage ActiveX in any way,
ActiveX is managed by legacy IE11 group policy settings, not via EMIE.
e.g. via AXIS (ActiveX Installer Service) etc
https://learn.microsoft.com/en-us/internet-explorer/ie11-deploy-guide/activex-installation-using-group-policy