In the most recent Zoho Projects iOS app update, we have supported the milestone owner field layout customization within the milestone add/edit form. Now, you can add a milestone without assigning it to an owner if the owner field is set as non-mandatory.
Also, in the add milestone form, the default value that is set for the owner field on the respective layout will be populated.
Please update the app to the latest version directly from the App Store or using the link given below:
Feel free to try out the feature and write to us at
projects@zohomobile.com anytime you need any assistance. You can also submit the feedback within the app(Go on to the app settings > select Write to Zoho support).
Have a nice day!
Regards,
Sneha