How to encrypt files in EXCEL tables to avoid being seen by others:

1. First, open the excel document and click "File".

2. Click "File" and click "Options" in the pop-up options to enter.

3. Click "Security" in the "Options" dialog box to enter.

4. Enter "Open Permission Password" in "Security"-"Open Permission" to set it.

5. Enter the password, confirm the password again, and then click Save.

6. Close the document. After reopening, you need to enter a password to open it.