Hi @Gorilla_8 ,
Could you please share a bit more about the issue that you mentioned? What do you mean?
Do you mean that the Height property of the Data card in your custom Edit form could not set as specific value? Please share more details about your issue.
Based on the issue that you mentioned, I have made a test on my side, and don't have the issue that you mentioned. The Height property of the data card in my custom Edit form works well.
Please consider turn off the "Snap to columns" option for your Edit form, then try to set the Height property of the data card, check if the issue is solved:

Of course, you could also consider associate the Height property of the data card to the ComboBox control inside it. Please consider set the Height property of the Fonte data card to following:
DataCardValue11.Y + DataCardValue11.Height + 15
Note: The DataCardValue11 represents the ComboBox inside the Fonte Data card, please replace it with actual control name in your Edit form.
Please consider take a try with above solution, then check if the issue is solved.
Best regards,