On this dialog, you can enter a "*" wildcard pattern in the "Member" field to search for all members where either the member name or text matches that pattern. The "*" wildchard character can be in any position; e.g. "A*" or "*A" or "A*B" or "A*B*C", where "*" matches any one or more characters.
For example, you can enter "*CUST*" for the "Member" field and click the Search button.
That could produce this result list. You can perform the same kind of search on this Source File dialog. To see all members, specify either blank or *ALL in the "Search Member Name or Text" search box.