There is an arrow on the bottom right of the CKEditor that allows you to resize the answer form while writing an answer:
If you want to set a different default initial size then you should edit the file qa-plugin/wysiwyg-editor/qa-sysiwyg-editor.php and add this line (with the number you want):
" height: 1000,",
immediately after this line:
" defaultLanguage: 'en',",
Autoglow may be useful for you. However, it has some side effects. I recommend to test and tune it on local environment.
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