Hi Brian,
There does not seem to be an option to switch that off currently. You can try doing two things
1. Click on the Settings icon of the Summary change and select 'Abbreviate Value'. If you have a big number on there it would shorten it and make it easy to read.
2. Try changing the size of the visualization in such a way the text does not overlap.
Let me know if this is helpful.
Tanmay