IE Enhanced Protection Mode of IE adds an additional layer of restrictions to the browser, by running website content in MS AppContiner which is a kind of sandbox environment. AFAIK this feature is OFF by default because of compatibility issues MS had with it.
Anyway, we don’t have plans to support this legacy mode.
We do highly recommend upgrading from IE to newer browser technology like - Edge, Chrome that are considered safer and to protect your Endpoint system with SandBlast Agent, including its sandbox and sterilization capabilities.