How do I solve the "Low KDF Iterations" warning?

@jimer2 The last screenshot that you posted showed your email address at the bottom. To protect your privacy, I have replaced the screenshot with a redacted version that has the email address removed.

In any case, your problem is that in the “Encryption Key Settings” screen, you need to change the value of “KDF Iterations” from 100000 to 600000 before clicking the Change KDF button:

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