To change this to another symbol, click on a check box, open the Developer tab, and then click Properties in the Controls group. On the Content Controls Properties pop-up box, use the Change button next to Checked Symbol to select a different symbol, and then click OK.n the Word Options dialog box, check the Developer box under Main Tabs, and then click OK to enable the Developer tab. Place the cursor where you want the check box to appear, and then click the Developer tab. On the Controls group, select Check Box Content Control to insert a check box.