So either widget can be used here. You can have either one appear on the top.
To do so, first find the material used by your widget component. This is usually a default material like “Widget3DPassThrough_Translucent”. Once in there you need to set the Blend Mode to Translucent in the material’s details panel.
Lastly, under the “Translucency” section, check the “Disable Depth Test” option. This is the most important part, and SHOULD make it render in front of everything, basically making it a “Screen Space” widget without it being HUD.
The non-blue one probably already had this set correctly. 
The blue thing is also fixable here, you just need to change the “Shading Model” to “Unlit” as it’s probably set to “Default Lit”.
Give that stuff a try and let us know!