In Hugo, you can resend the same email campaign to non-openers in one click:
To resend unopened emails, go to the Campaign Management —> Campaign reports:
Find the sent campaign you want to resend, click to open the report. Here, you will see all your campaign's report data. Scroll down to not opened:
Choose a way to resend your campaign and click Resend:
It will be copied and sent subscribers who did not open this email (includes subscribers newly added to the lists after this campaign was sent).