Description:
When I select File/printer configuration I try to change the paper size to the actual paper in my printer, but the option to change the paper size is grayed out and not available to the user.

I set the printer with cups web interface. Set the default paper size to Letter. But the Libre Office Writer Versión: 5.2.7.2 Id. 1:5.2.7-1+deb9u4 printer configuration dialogue window stays at the A4 paper size despite the printer defaults being set to Letter by CUPS.

Steps to Reproduce:
1. Click on File, and select printer configuration.
2. See that the option to change paper size is grayed out.
3.

Actual Results:  
Paper size is still reported as A4

Expected Results:
Paper size should be reset to Letter.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
[Information automatically included from LibreOffice]
Locale: es
Module: TextDocument
[Information guessed from browser]
OS: Linux (All)
OS is 64bit: yes

Should have let the user set the paper size as he desired. Should not have the paper size command button grayed out on the printer configuration dialogue.

Bug occurs whether or not OpenGL is enabled.

Versión: 5.2.7.2
Id. de compilación: 1:5.2.7-1+deb9u4
Subprocesos de CPU: 2; SO: Linux 4.9; Repr. de IU: predeterminado; VCL: gtk3; 
Configuración regional: es-ES (es_ES.UTF-8); Calc: group


User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0