Hi @Bob43, welcome to our forum!
There is no other way to answer a call using the default phone application in the phone, you will need to swipe the green phone icon to the right to answer the call.
I would recommend that you have a look in the Google Play store and see if there are other phone applications that have for example, a button that you tap to answer the call or something that suits you better.
I hope that answers your question!
