The related list does not load when the form is loaded on Internet Explorer 11
The issue happened due to the CI relations formatter configured in the form section. In large networks, a list of related CIs might be excessively long, which can slow performance when a CI form is rendered.
Please configure the below three properties as mentioned in the below document based on the organizational requirement and best practice (which would be the default values of these properties )
Also please note that it is good to use the new CI relations formatter and not the Legacy CI relations formatter.