To restore default settings for a specific grid, access its menu and select the word Default Settings.
The column order, size and choice of which to show and hide are returned to the original conditions of the software.
Selecting the word Default Settings from the menu of a form restores the initial conditions of all of the grids within that form.
The change is implemented by the system doing a refresh of the application. If there is unsaved data that you do not want to lose, stop the operation and save the data.