Non Librecad DWG files-Lettering barely visible in Librecad

I have a whole set of house plans created twenty years ago on a long-forgotten cad system that are in DWG format.  I can open the DWG files in Librecad 2.1.3.

Problem: When I open the DWG file the lettering on screen prints in light yellow which is barely visible.  

Is their a way to change the color of the on screen letters?  A global change to change the color of all letters everywhere on the drawing?  The drawing is all on one layer.

There is no way to select letters exclusively for changing a property. You could select all, then go to modify - attributes - color - black/white and so change the color for the whole drawing, not only letters.
Or just change the screen background color to black. Or, if it's just for viewing, view it in print preview mode and toggle to black/white mode.