Besides looking at column name text color, you can do the following:
1- Mouse hover the column, it should pop up that info on a tooltip like display.
If it doesn't work the first time, just get the mouse out of the table and hover again.
It triggers after a few miliseconds, if you have the focus on layout pane.
But you can also enable column type listing, and it will show all types, directly on the table. Really useful when you need to print the layout.
There is an Icon (123) that should toggle this option (Show Column Data Type).