Hello Myra, thank you for your answer.
The first layout is 43 cm x 29,5 cm; the second is 21,5 cm x 29,5 cm, and the third is 360 px x 1000 px intended for any phone. I am trying it in chrome emulator with iPhone 5 or 6/7/8. The names are Custom H, Custom V and mobile. I just changed the third name to Custom V 375 px but the result is the same.