Thank you for the response! I am using the Gutenberg editor. I have opened the pages in Code Viewer and found the part that specifies the password and removed it, similar to what you suggested with Classic Editor. The images are still showing correctly. I will need to wait to see if Smugmug email alerts are not coming in anymore, it takes some time for those to be sent.
Also, to clarify, I have a site-wide password for Smugmug, not individual gallery passwords.
Please let me know if you come up with a more permanent solution to this.
Regards,
Maciek