Prerequisites
Changes you make to a standard layout will affect other users' reports that use that standard layout.

You should only change a standard layout if the change is required for all reports that use that standard layout. If changes are only needed for one report run or for a specific report, you should change the report parameters using the Layout functions on the Change Report: Initial Screen. For more information, see
The layout parameters are copied from the standard layout into the report layout. There is no permanent reference to the standard layout. When you create a report, the layout settings are copied from the standard layout into the report layout.
If the standard layout is changed, the layout parameters in the report are not updated automatically.

Do not change the standard layout (SAP) that is delivered with your SAP R/3 System.
Procedure
The Change Standard Layout: Initial Screen appears.
The Change Standard Layout: Header screen appears.

Suppose you give the report the standard layout SAP and then change the report width to 60. Then you assign a different standard layout to the report. The report width remains at 60, since it is a change that you made that is specific to the report.
For information on transferring the settings of the standard layout to a report, see
Standard Layouts.If the standard layout is changed, the layout parameters in the report are not automatically updated. The indicator Change allwd dur exctn allows you to save any changes you make to the layout when executing the report.

Select the Change allowed during execution indicator only in the report header.
If a user has authorization to change a report, he can change this indicator in the report output with Settings ® report layout ® Page/control ® Change allowed during execution. Another place you can change the setting of this indicator is in the report definition with Report header. If you only change the indicator Change allowed during execution in the standard layout, the change will only be effective in the report if you reassign the standard layout to the report.