Hello,
To avoid confusion, galleries whose source is empty still display the controls that are in the gallery when we are in the editor.
On the other hand, when you press the Alt key to simulate a user click, the studio display also switches from editing mode to user mode, in this case if the gallery source is empty, no control of it is possible. appears on the screen.
To be able to simulate a click on a gallery control, the gallery must contain at least one item to display
Otherwise the control must be placed outside the gallery
For the error on the Back() formula, you should not put anything between the parentheses because this formula does not need arguments, it navigates back to the last screen.
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