you could: 1) create a model just for that field. You would need to add a field editor for just that field in your layout. Then you could render the button based on that model having unsaved changes. 2) you could create a model just for that field and then use a Ui only formula to compare the values between the notes field in your primary model and the notes field in the second model. Based on whether they are equal or not, you could render the button. 3) same as two but instead of ui only formula use branch logic in the action sequence.