I can't remember who it was who posted about the lack of a structure view in EDBManager so as a general tip here's what I'm doing
CREATE VIEW "Table structure" AS
select tablename,name,type,"length",scale
from information.tablecolumns
order by tablename
and then using Set Filter to get the specific one. Not quite as convenient as the structure view in DBSys but a lot better than what comes built into EDBManager.