It is possible to change one property in several reports/forms at once in Access using VBA code. Here is an example of VBA code that can be used to set the Pop Up property to Yes for all reports:
Sub SetPopUpProperty()
Dim obj As AccessObject
Dim rpt As Report
For Each obj In CurrentProject.AllReports
Set rpt = obj
rpt.PopUp = True
rpt.Save
Next obj
End Sub
To use this code, open the VBA editor in Access by pressing Alt+F11, create a new module, and paste the code above into the module. Then, run the SetPopUpProperty subroutine and it will loop through all reports in the current database and set the PopUp property to Yes.
Note that this code will also save each report after the PopUp property is changed. If you want to modify forms instead of reports, you can modify the code accordingly by changing the "AllReports" property to "AllForms" and changing the variable type of "rpt" to "Form".