This BV6000 has replaced a Samsung S3. On that when the phone rings you just have to slide any way you like to unlock and answer. Once answered I have 6 big buttons that allow me easily to select loudspeaker particularly when I am driving.

On the BV6000 I have to slide to the right, this is particularly hard when you are using your left hand (right hand drive car) and then I am presented with a row of really small buttons, one of which is the loudspeaker option.

More often than not I miss with the slide and am presented with a menu that I don't want because my finger slid upwards instead of sideways. At that point I usually miss the call because I am driving.

Is it possible to change this screen / buttons anywhere to make it more like my S3 was with bigger buttons?

Hello,

Of course, you may install one (or more) of many dialer applications available in Google Play. Some of them are free.
Please remember, that operating the phone while driving is dangerous. I really recommend to use BT radio to answer calls.