This will update the number of characters that appear on the course tile. The default number of characters is 200.
Step 1. Login as an administrator and select Administration
Step 2. Select Site Administration
Step 3. Select Plugins tab.
Step 4. Scroll down to find Blocks category
Step 5. Select My Courses (block)
Step 6. Locate Summary character limit
Step 7. Update the summary character limit, which will limit the number of characters that will be displayed on the users home page. The default is 200.
Step 8. Scroll down to the bottom of the page and select Save Changes
The summary character limit has now been updated.