Can I export my Game Plan to Excel?

Yes, in one click. In the Game Plan, open Actions, then Export: Heirloom downloads the plantings of the season in view as an Excel file you can sort, share or print.

The file holds the whole season: filters and search do not apply to it, so sort or filter in the spreadsheet itself. For a sheet to pin up in the shed, the Crop Map has its own print: see Print your Crop Map.