How to change gray frame back to colorless frame

[Aasata0]

The number of days that have not been entered will turn into a colorless frame, those that have reached the goal will turn into a colored frame, and those that have not reached the goal will turn into a gray frame. If we use the analogy of medication dosage, sometimes after entering the dosage, we find that we entered it incorrectly and forgot to take the medication that day. If we change it to 0 again, the frame will change from a colored box to a gray frame, but no number has been entered. Or even if you enter 0, it cannot return to the colorless frame. Is this related to system settings? Thanks