You would edit in Crystal and lengthen the field

Each stub section has its own subreport. So in Crystal Reports you would have to choose Edit Subreport and widen the description field there. Note there are 4 subreports, 2 of which conditionally print based on your format (Stub/CkStub, Check/Stub/Stub, etc). If you're not sure how to identify which subreports to modify, either you can experiment / guess on those and then print to test OR you can modify all 4.