Previous columns are also fixed

What causes this issue?

You are editing the column elements of a table control and set the
attribute "Fixed column" for a column. There are columns with a lower
number that are not fixed.

System Response

You can only fix a connected starting area of columns of a table
control. The system therefore assigns the attribute "Fixed column"
automatically to all the columns having a lower column number.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.