If you go to export-share/devices/custom/advanced settings you can make any preset you want. Select H.264
Uncheck the lock next to the resolution (hight and width) first, adjust the parameters to your liking.
Hit OK and give it a unique name.
Please don't post the same question more than once! It's very confusing.
I'm going to lock this thread. Please follow up with this conversation in your other thread.