When creating a View, you can opt to control the visibility of columns. These can be fully hidden while you are working with your data, hidden on both current and output Views, or initially hidden (but visible when required).
When you have clicked on a column heading you can use the Visibility button menu (shown above) to control how a column is seen.
An initially hidden column in its visible state (below):
The same column in it’s hidden state:
If you want to control the visibility of a lot of columns in one go, or need to restore a previously hidden column, then you can use the Show / Hide Columns command on the Settings menu.
The dialog displayed (shown above) will indicate the current state of each column, and also provide a quick route to the visibility of as many columns as you wish. Simply set the appropriate menus to your desired values and click the Apply button.