Hi @Halstead ,
Could you please share a bit more about your formula?
Do you want to show up a Dialog Pop-up Box when you press a button, to collect user entry?
I have made a test on my side, please consider take a try with the following workaround:

Firstly, you could add several basic controls in your app, e.g. Rectangle Icon, buttons, Label, Text Input box, ...., then make them into a Group control (press "Ctrl" + "G" hotkey, or go to "Home"-> "Group"-> "Group" option) as above screenshot.
Set the OnSelect property of the "Entry" button to following:
UpdateContext({ShowPopUpBox: !ShowPopUpBox})
Set the Visible property of the Group1 control to following:
ShowPopUpBox
Set the OnSelect property of the "Submit" button to following:
Patch( // use Patch function to collect entered Text Input box value back to your data source
ProductsCollection, // ProductsCollection represents my data source, please replace it with your own data source
Defaults(ProductsCollection),
{
ProductName: ProductNameTextBox.Text
}
);
Reset(ProductNameTextBox)
Set the OnSelect property of the "Cancel" button to following:
UpdateContext({ShowPopUpBox: !ShowPopUpBox})

More details about configuring a Pop-up dialog box in PowerApps, please check the following video resource:
https://www.youtube.com/watch?v=OIiMeKWRuuk
Best regards,