You can't bulk change that option on all pages. But what is the purpose of doing this? Running sequentially the request is normally something that needs to be done on specific use case and not in general. Could you tell us why you would need to do that on all your pages?

Dear Garisanoori,

The setting cannot be applied automatically on all pages. We designed it as a punctual workaround for the rare cases when the parallel execution doesn't execute the requests in the good order.

Why do you need to play all Pages sequentially?

Indeed requests inside the same page are executed in parallel. But pages are executed sequentially. So in your example i do not see why request2 is executed if requests is stil in progress. Unless you put your page under fork logical action. Is it the case?