I know that Microsoft is in the mode of mobile first, but when will browser / desktop views be available? We have built some complex forms and views using InfoPath and PowerApps is a bit limiting in this regard.
When building apps to be run in the browser exclusively, I would recommend that you select the "Tablet Format". This format is designed to work well on desktops, tablets, and even large phone screens. It is on our roadmap to further enhance this experience so that you may create apps from data using the Tablet format, however I don't have any specific dates to share yet.
Please feel confident that any app you build in tablet mode will work well in a browser / desktop view in the meanwhile. We have a great selection of templates you can use to get started building beatiful apps for destop and browser. You can locate these at web.powerapps.com on the Home page. Click on the Office filter in the templates section to see some of my favorites.
Please review these articles for additional guidance: