Users have complained that the Custom Forms viewed within the New Experience are more difficult to view than they were in Classic. Everything looks stacked and information is harder to view and understand.
The workaround I've given them is to go into the Project's settings and to view the Custom Forms there. However, that's a wonky and clicky solution to something which should be the same as it is in the Project settings.
Please make the Forms look within a Project the same as when they appear in the Project settings.