That is not possible. The hamburger menu is triggered by the width of the browser and it does not depend on the actual device.
The white space you see is because of this part of the code:
@media (max-width: 979px)
.masthead {
min-height: 129px;
}
Please change the value of 129px to find the best value. I think 100px can be a good value.
Kindly open up new threads for additional questions as it will help us to focus on each issue and give you a better support which you deserve. Having a long threads makes the maintaining job harder and also it will be harder for the other customers to find the correct information if they have similar issues. You are always welcomed to reply to this thread to follow up the same question.
Thank you.