In version 0.38, how do I take a thumbnail of my car in the showroom

Excuse me, I find that I can't take thumbnails in the "showroom" map. How can I take thumbnails for each of my vehicles?

 

In the showroom tools tab (which appears when you get on showroom map) you can find thumbnail generator.
As there is no proper way to create just one screenshot for a specific config, you can use this tool: https://www.beamng.com/threads/vehicle-screenshot-creator-for-single-config.95936/

 

I have tried this tool, but the menu does not appear.

 

Strange, it should appear right when you open the map. Maybe check the opened tabs from beam? Sometimes they can get hidden (at least that is what happened to me).
Or you can go check file integrity through Steam and clear cache. If that won't work... then I don't know. Then you may try going to official discord server, maybe someone can help you there more.

 

when you launch freeroam you coche display dev auxilary content and a map nommed showroom is here

 

No you can't translate french words in your own way, there are rules x)