Inside the Inventory and Order pages, Columns can be added or removed. In both tables the settings menu is in the same location. At the very rightest corner of the table there is a small grey + (I am using the order page columns as an example here)
Pressing it opens a new pop-up window with column names and checkboxes near them.
Select or deselect the fields as you see fit and press Save.
Be aware that enabling all of the fields will require to scroll the table to the right to see everything on smaller screens.
Alternatively you can remove all, but the most important function columns.