Can I delete the custom view form fields?
The custom view form fields is generally used in two places - to display at the grid view and to specify the criteria.
You can delete the custom view form fields only if it is selected to display in the grid view. For example, if you've chosen the "Contact Number" field to display in the gird view (refer the image below), then you can delete it from the respective form.
The Custom view form field cannot be deleted if it is specified in the custom view criteria (refer image below).