@jacqueline You can use custom plugin solution shared in the following topic to display slider image size however you want.
https://colorlibsupport.com/t/increase-slider-height/#post-66716
If you have more questions then to help us keep support thread separates could you please create your own thread for your question here https://colorlibsupport.com/c/activello/ instead of replying on others thread as it makes the thread messy and hard to read.
If you want to you can also add reference of this thread in your newly created thread.
We would be more than happy to help you on your new thread.