In LO forms as known in the Base UI may have more than 1
main forms, all belonging to a forms collection.

MSAccess does not have that feature.

So far, only forms with 1 main form - from far the majority of cases -
were fully supported by Access2Base. For other forms, the
exploration of controls in additional main forms was not
implemented.

Current limitation: some form properties (e.g. RecordSource) are
still limited to the firt member of the forms collection.