ROI extration

I use PolSARpro6.0, and Sentinel 1A ,C-band dual polarization SLC data. When I want to extract RIO,I’failed.
Tools—>Data Set Management—>ROI Extraction->Graphic Editor.
The image in the pop-up window(MapAlgebra v1.1) is so small that I have no way to do a region selection operation on the image.
So I can’t click “run”.
When I want to do supervised training, I also cannot create training samples.If you can give help ,very thanks!

can you maybe provide a screenshot which helps us understanding your problem?