To open full map with all DLCs you have choose two ways – just download ready profile or create one yourself. Or even modify your existing profile. Please be careful and make a backup of your game profiles before starting

The Guide showing process on ETS 1.43 for January 2022 and with DLCs including Iberia and can be outdated in the future when SCS release new map content. But the method can be reproduced later if you have proper source of map sectors.