Global Setting for "Full width" and use of the setting as default for all pages

[MWL1701]

Is your feature request related to a problem? Please describe.
My request does not come directly from an issue, but there is one thing that simply bothers me and cannot be permanently adjusted.

Describe the solution you'd like
It is possible to set the "full width" to be used for each page. This works well up to a certain point, but at some point it always resets itself and I have to check it again.
I would like to have a global setting so that “Full width” can be set as the default setting and then the full width is automatically used for every page.

Describe alternatives you've considered
I have tried several times to find out when this setting resets per page, but I haven't found out yet.

Additional context
n/a