It is possible to restrict which Columns are shown in the stock item screen by selecting the File Fields in the User Permissions area. To edit these settings, go to Setup > Users and edit the desired User. Expand the File Fields > Stock Items options, and then select which Columns you wish to appear in the Stock Item Grid.
To view the Stock Item Grid with the selected columns, make sure you have logged into Idealpos using the correct User account. Each time you log in as a different user, the stock item screen will be updated.