Crop marks are set as part of the printer settings. To remove them, go to File>Print, click the drop-down arrow next to your printer, and click Advanced Output Settings. That’s where you control your crop marks.
Click File to open the Backstage view, and click Print.
Under Printer, click the arrow next to the printer, and click Advanced Output Settings.
On the Marks and Bleeds tab, under Printer’s marks, uncheck the Crop marks box, and click OK.