How to enable components?
Are you logged in using super admin user(i.e user id = 1)?

Here are some advice to solve the issue:


Recheck visiting component page if the components are enabled.
Please check Drupal permission.
Clear Drupal and CiviCRM cache.
Check Navigation links for Grants, Case etc by navigating to Administer >> Customize Data and Screens >> Navigation menu
Do menu rebuild /civicrm/menu/rebuild?reset=1


HTH

Pradeep