To find out more about Export Emails to Google Sheets by cloudHQ, click here.
To install Export Emails to Google Sheets, click here.
To start wizard to export emails to Google Sheets, click here.

To export a single row per email conversation (thread) in your Google Sheets export, enable the option labeled One row per email conversation. This option will ensure that entire Gmail conversation is put into a single row, rather than creating new rows for each reply or forward.

You need to enable the option One row per email conversation :

This option is not available for email parsing.

You need to create a Save Emails export job.

save email; save email correspondence; save email exchange; backup to sheets;