I would like to use a SharePoint Designer to show a form (DispForm.aspx) as a popup instead of opening into a new tab.



No need to re-invent the wheel in SharePoint Designer. Adjust the list settings > Advanced settings > Launch form in dialog > Yes

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No need to do this via SharePoint Designer and you should try to

Open List > List Settings > Advance Settings > scroll down to dialogs check Yes

as shown below.

enter image description here

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