Pages Panel :: icon size small only

[thomaso 288]

When I change in a document of facing pages the page dimension of page 1 (for instance to use it as cover) and delete one page at the end of the document then all page icons jump from medium size to small size.

– That can't be undone.
– They remain small even if set to large.
– They remain small even if I close the document without saving + reopen it.

Icon size before page delete:

 

Icon size after page delete:

 

Icon size set to large: