As with all good things in life, there are two ways to do this. The first is to right-click on the table in the database window and select Properties. Check the 'Hidden' Attributes check-box and, provided the ability to view Hidden and System objects hasn't been enabled (Tools, Options) the table will be hidden.
The second method makes more sense, to me at least. What sort of tables do you want to hide? Tables that store code lists perhaps, or other 'pseudo-system' tables? They're the only ones I ever hide anyway, but I digress. Try prefixing your table name with 'USys' (as in User System table, presumably), then gaze in wonderment as your table disappears from the database window, again provided the ability to view Hidden and System objects hasn't been enabled.