Column widths too big and / or too many key figures selected.

What causes this issue?

A selection list can have a maximum width of 1023 characters. In the
current user setting, the quantity of key figures and the column width
that you have selected are such that the maximum width of 1023
characters has been exceeded.

System Response

The system does not save the currrent user setting.

How to fix this error?

Choose a smaller column width or delete some of the key figures you
have selected.

Error message extract from SAP system. Copyright SAP SE.