uniformly, all JSON items show their field names while on scene stage so what you see are the fields coming from the weather api. note that the fonts you specify is the font you will actually see. to aid with your layout, you can select the JSON Item and in its Properties | Definition, set the field path to an actual value such as shown in this screencap
https://www.screencast.com/t/DM2uQWrlpm - after you are done with your layout, you can then go to Properties | Component to set it to the proper field.
as for getting back the Weather Player/Item, we will be dropping this completely in future iterations. from the developmental perspective, it is more difficult to maintain both the older component and the new component as the older component is using old coding standard with limited possibility from improvement while the new component has wide berth for improvement - that said, we will ask our devs to find other ways to aid users without resorting to above workaround.