Continuous Form as Subform - Can't Modify Data

I have added a continuous form as a subform to a single form. When I view the form in Form View I am unable to modify the data contained in the subform (which is continuous). When I open the continuous form as a standalone form I am able to modify the data.

Ultimately, I want to add multiple continuous forms as subforms to the main form. Has anyone ever seen this issue?

I have had the same problem in the past. The solution is in the data tab of the form property. Take a look at this screenshot:

It's a german localisation but I am sure you handle it. Change these settings around (yes or no) and test if it works. I do not remember which property exactly solves your problem but it is one of those four.

Reason behind it: With these properties you can alter the behaviour of the form. Sometimes you want a form that just shows data without letting the user make changes to the data.