How can I correct the survey so there's an equal number of respondents in the 3 sample groups?

So you are basically asking that out of your three experimental conditions, you have one condition that has more responses than the others, and if you conduct the experiment with only two conditions, would the idea even work?
Is that a question for Qualtrics or will it be more appropriately answered by you, your advisor and the literature?

https://www.qualtrics.com/community/discussion/comment/35214#Comment_35214What I mean is I've had 51 responses in survey group 1, 49 responses in survey group 2 and 47 responses in survey group 3. This is because I've had to delete some responses that were rushed. Is there a way I can change the survey now, so that I get more responses in survey group 2 and survey group 3, so that the number of responses are equal in each survey group?
Thanks very much for responding again Ahmed.

When you were deleting those results, did a pop-up appear asking you two things? Did you tick them? What was the second one? Have you read the support pages about randomizer?

https://www.qualtrics.com/community/discussion/comment/35219#Comment_35219Thanks for sending. I've just read the support page and clicked 'edit count' to favour the survey groups (question blocks) that have been answered less times. Also, when deleting the results, I clicked 'decrement from results' as I believed this would make the sample size equal in each survey group.