Kobo Libra 2 - images in epub documents

Hi,

I encounter difficulties when images are embedde in epub files :book2::
- I can easily zoom in/out on texts zones
- but I can never zoom on an image

Is this a as-is feature or am I missing something ?

Example : nordic detective novel (eg Norferville), plan of the region is depicted.
I can not zoom in on the plan.

I have already encuntered that several times. I find this annoying:(

TIA for insight and hopefully help :smack::thumbsup:
:help::o