First option would be to click on “Column settings” buttons which you can find in header of every column in “Table preview and columns setup” section.
After that Column settings modal will open and, under “Display” tab, you can find “Visible on front-end” option.

Second option would be to click on “Complete column list” button  to open a modal where you can quickly access some column settings.
In the modal you can click on show/hide icon to toggle visibility for each column.

It is recommended that if you don’t need certain columns to remove it from data source or select query for mysql tables if possible.
It will speed up loading of the page and result in more clear look of column setup section.