No, you can’t get it. You are requesting a new feature.
… I know in this forum some other people have ever expressed their wishes for the feature. Katalon has done nothing about it.
If you want a single report, you should not use a Test Suite Collection at all. You should transform your seperated 3 Test Suites into a single united Test Suite.
A similar case. I discussed with @dsingh1 and I wrote “you should stop using Test Suite Collection”
I think that Test Suite Collection is not useful, it confuses many people. Not only you, @joost.degeyndt