Reduce clearances/thermal relief between shapes and clines

Hello,

I'm using allegro 16.6 and I'm having some difficulty with clearances between certain shapes:

From my screenshot, I'm trying to connect all the areas in red together (they are all RXGND). Is there something I should be using such as global parameters or some box i need to tick for these smd pads to be covered?

Cheers, 

Fraser