I'm looking to use the FMX planner for the first time. I see from the demo how to replace all the fields with a custom panel but I only want to add 1 or 2 to the existing. Is there a way to do this? For example, a label and checkbox after Title and before Text?
I'm not sure I understand your question.
Are you referring to displaying 2 fields inline in the Planner item or are you referring to the item editor or do you refer to something else?
The Planner Item. For example, on the editing demo a new field between Title and Text for example
This is not possible, the default dialog cannot be changed. You need to use the custom panel option, it is designed exactly for that purpose.