To block key combinations in SureLock, follow steps mentioned below:

1. Access SureLock Settings

2. On Main Menu screen, tap on Keyboard Settings

3. On Keyboard Settings screen, tap and select Keyboard Filtering

4. On Keyboard Filtering Configuration option, tap on Add Key

5. On Keyboard Filtering prompt, select the key, tap on Existing Key tab

6. Tap on Key dropdown menu, to select a key

7. Once Key selected, select the Function keys from the following:

• Ctrl
• Alt
• Shift
• Windows

8. Tap on Add to complete