The Risk/Issue description attribute size is read only with a Maximum size of 250 characters. Is there an option to increase the size?
Unfortunately it's not possible to increase the size of the Out-of-the-Box Risk/Issue Description field (string type attribute), but one option would be the below:
Create a new custom large string attribute. You could then create a custom process that copies over existing data from the Out of the Box Description attribute to the new custom attribute if you wanted to have the existing data available in the new field.