Yes, you can change your password by logging into Plesk, navigating to the 'Account' section, and selecting the option to change your password.
To change your password:
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Click the Change Password link in the navigation pane.
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Enter your old and new passwords.
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Click OK.
https://docs.plesk.com/en-US/obsidian/quick-start-guide/getting-started-with-plesk.74372/