Can anyone help me understand why I am not allowed to open a form from a grid card? The option is greyed out. I am able to open the form from a field card, but not from the grid card. See screenshot below.
Please see the below option if this option is disabled then you will not allowed. Please enable option So, it will allow to open a form from a grid card.
To enable => Edit the Form from the grid Card and enable it.
Hope, It will help you.
Can you please check if you have enabled the option of choosing the parent as @naushad786 suggested. Let us know if it doesn't solve your query