There is no direct way to move questions from one block to another, this can be done with the "Question Library" feature.
1. Go to the block and click on the "Add question" option to which you want to add the questions from other blocks.
2. Select "Question Library" and under it "My Surveys", choose the name of the survey from the drop-down list: https://prnt.sc/V8SKFfPrf4wQ
3. Select the questions and then click the "Add selected question" option: https://prnt.sc/u_XUsh433ShS
In this way, you can move the questions from one block to another.
Video steps: https://www.screencast.com/t/aK6yfBj1i