You pin a column by selecting Pin column in the column menu in Edit table setup. A pinned column stays in place when you scroll sideways, so that you, for example, always see the name of the row.
How to do it
Click Table setup at the top of the table.
Open the menu (three dots) in the header of the column you want to pin, for example Group.
Select Pin column. Pinned columns have a pin icon in the header.
Click Save setup.
How to unpin a column
Open the column menu in the table setup again and select Unpin column. To unpin all columns, click Unpin all at the top of the table setup. Click Save setup.
Good to know
In many tables, the first columns are pinned from the start, for example Name and Account number in Account.
Pin only the columns you need to see all the time. Many pinned columns leave less room for the rest of the table.