You can see which students have different enrolment modes using the Custom Report Writer. For more details on how to assign different enrolment types, see this article: Adding guest students and changing enrolment modes
Create a report as shown in this article: Creating bespoke reports in the Custom Report Writer
When adding columns, you can add one for Enrolment Mode. This will produce a report similar to the example here.
Top Tip: Students without an Enrolment Mode explicitly set will be assumed to be Single Registered for the census, but will show blank here.
To see only students with a certain enrolment mode (such as Guest students), click to edit your report and add a filter.
You could use a similar filter changed to Is not one of... to exclude certain enrolment modes.