Hi qsoft_developer,

qsoft_developer

I would like the user to still have the option to change the layout in case he wants to, but the default should always stay on landscape.

As far as I know, we couldn't directly modify the Chrome default setting by html codes. The browser only support modify the print setting by using @page.

I suggest you could post this issue on the chome forum as below url:

https://productforums.google.com/forum/#!forum/chrome

Besides, IE doesn't support modify the size by using landscape, I suggest you could also post this question on below forum.

https://social.msdn.microsoft.com/Forums/en-US/home?forum=iewebdevelopment 

Best Regards,

Brando