Device Related Classes

How to stop to change device classes?

What do you mean? Explain please

Also this Device detecting library adds additional classes on element which can help you with different CSS styles for different OS and platforms. THe problem is change layout and i would like to disable it

No, it is impossible to disable it, it is a core thing of Framework7

how can I use the same layout however it change itself - classes?

You can specify the theme layout in framework7 parameters :

thank you.
myApp = new Framework7({
theme: ‘ios’,
How do I know where is the path for ios (theme)?