Grammar check does not show readability statistics due to disabled.
Cause:
The 'Show Readability Statistics' option is disabled on the 'Grammar' tab page of the 'Options' dialog box.
Solution:
Select the 'Show Readability Statistics' check box in the 'Options' dialog box, and then perform a grammar check.
1) Select the 'Tools' menu and select 'Options...'. (The 'Options' dialog box appears.)
2) Click 'Grammar' tab.
3) Select the 'Show Readability Statistics' check box.
4) Click 'OK'.
5) Select the 'Tools' menu and select 'Grammar...'. (The 'Readability Statistics' report box appears after all grammar issues are checked.)