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In your case, your theme adds the placeholder to the output of the field labels and suppresses the field labels. Unfortunately, this is written in a JavaScript file in your theme, which is why you probably cannot adapt it.
I therefore see 2 possible solutions:
a) You show the field labels by forcing their output via CSS. Add to this
body .comments-area label { display: block; }
in Appeareance > Customizer > Additional CSS.
b) You ask the theme developer for support at this point.
… just doesn’t look pretty. Add the following CSS code:
body p.comment-form-comment { height: auto; }
body #commentform > p { margin-bottom: 10px; }Then it will also look readable.
If you consider it solved, feel free to set the topic to solved.