How do I increase the size of the directional arrow? Please Help!

I have Locus Maps installed on my Android Phone and tablet. When I'm riding my ATV and following a GPS track I imported on my phone the directional arrow is pretty easy to see but it's small and difficult to see on the tablet. Is there a way I can increase the size of the directional arrow when I'm driving? It's very frustrating and difficult to use with a tablet, but I like using a tablet more than my phone because of the screen size. I feel like this should be a very easy fix but I can't find it in the setting anywhere. I don't want to switch to another GPS program if I don't have to. Any assistance with this issue would be greatly appreciated.