I create an encrypted file on my mac and it always opens without the password.  Wh,y?

I have tried several times to create an encrypted file on my iMac, following the procedure Apple lists, using Disk Utility.  Each time, the file opens without requiring a password. Hence, there is no security.  What am I doing wrong?

Apparently, you missed this salient part:
If you select “Remember password in my keychain,” anyone with access to your computer may be able to open the disk image without entering the password.

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