Showing/hiding language layers in Illustrator .ai graphics in InDesign

Hi @yves.barbion ,

if you can see the language layers in InDesign with a placed Illustrator file one can handle the visibility of the layers in all placed Illustrator files using ExtendScript. The task is not that easy, because of a long-standing bug with InDesign where changing the layer's view of placed Illustrator, PDF files or InDesign pages will generate new IDs on the placed Illustrator files or PDFs.

For a working script see into:

Layer Visibility Overrides for all Instances of a linked file

crazyPanda, Jul 23, 2019
https://community.adobe.com/t5/indesign-discussions/layer-visibility-overrides-for-all-instances-of-a-linked-file/m-p/10554044#M149203

For script writers and all interested see also:

Place specific pdf layer into indesign with javascript
Yuliascript, Jun 18, 2018
https://community.adobe.com/t5/indesign-discussions/place-specific-pdf-layer-into-indesign-with-javascript/td-p/9914262

Important note:

You can see only main layers in your placed Illustrator files on InDesign pages and not Illustrator's sub layers.

Regards,
Uwe Laubender
( Adobe Community Expert )