Liquid XML Studio 2019
Caching Rules
User Interface Guide > Options > Environment > Caching > Caching Rules

Rules governing which files will be cached are based on the host name. Wildcards (*) are also allowed.

Only the host name should be included in the rule, leave off the leading http:// and any paths (i.e. /schemas/xml.xsd).

So if a schemas to be cached was located at

The host name would just be

To cache all http/https requests just enter a * as the host rule.