An example of the problem

  1. Check your .sii file ( chassis / cabin / accessory / etc )
  2. check if there is a line “hide_in xxx”
  3. remove them
  4. done

Reference :

https://modding.scssoft.com/wiki/Documentation/Engine/Units/accessory_addon_data

https://eurotrucksimulator2.com/modding_changes_114.php#Hide%20following%20views

Source :

https://forum.scssoft.com/viewtopic.php?f=160&t=176424&start=2650