The column's Cell editor
A cell may always contain text, icons, color and annotations this will not be affected by the configured editor.
Automatic cell editor
The automatic cell editor adjust itself to the grade type of each column.This is the default editor and the recommended one. See below how it works:

How to change the editor of a column
In order to change a single column's editor, double tap on that column and tap onCell editor
Changing the cell's editor on a group of columns
Tap on Tools (top bar) / Columns / Select your columns an EditHere is how to do it!.

Related articles
The list of available Editors: input marks, scores, grades and iconsCustom editors: Icons