I have a SP list with customized form through power apps[canvas app]. When I go to powerapps.com and preview the form [set size 1185x790(potraitxlarge)], it displays the form with perfect size. When I published the form and tried to click on the New button over the list view, it renders the customized form , but the form size is very little with right-side like a small mobile view.
One more thing I noticed is when I directly typed the list newform URL [/newform.aspx],it displays the page with only "submit" and "Cancel" button at the top and no control is getting rendered within the page.
Please help me resolving the issue.