Reply To: hello, how do I change the header?

Hello,

You can go to Dashboard > Slides > Sliders > there edit your Slider > under that you can find the option to define Height accordingly for the Desktop, Tablet, and Mobile:
https://snipboard.io/UHLEMv.jpg

Further, you can read more about WoodMart Sliders here: https://xtemos.com/docs-cat/woodmart-slider/?theme=woodmart

Best Regards