Hello,
The simplest approach to this would be one that you've already suggested of just changing the height of the form under the Form Properties tab. The intention is that you would be able to specify the height based on the fields that you've added to the form to ensure that the form can be exactly as tall as it needs to be to fit the content of the form.
It appears that the contents of your form would be going off the screen even when the form does take up the full screen height. It also appears that you're using some sort of search grid within your form. As an alternative approach, would you be able to move this large section of the form into a relationship tab itself?
If you still want to use the custom search grid you've built, you can move that section into a new, separate form and then render that form inside of a relationship tab. You can do this by following the steps laid out in this community project. Essentially, you'd add a new null relationship to your ItemType and then add use a Relationship View to tell Innovator to draw a form inside of that relationship tab instead of the normal search grid. This would likely require some minor updates to the way that the grid is populated, but I think it's the cleanest approach.
Chris
Christopher Gillis
Aras Labs Software Engineer