When is any tool that requires a pick, the selection cross hairs can be increased or decreased in size by pressing SHIFT + < or >.
With hi res screens and from n4ce 4.20c and on-wards there is a new option which allows users to specify the cursor scale. This is so that on 4k Screens etc, the cursor can be made even larger if needs be.
Select Settings > Display Options from the spreadsheet view of n4ce.
Once open, in the Bottom Right there is a Cursor Scale selection box. From here you can adjust the cursor scale and the change will be saved.