Hi Harald,

As of DataMiner 10.4 (CU14), 10.5 (CU2) and 10.5.5 there is a tooltip property on every layer. This tooltip will become visible when hovering over that specific layer (given that it's the topmost layer), see docs.

You can configure a static multiline tooltip there, or use the value of a GQI column by using string interpolation (start typing { to open the IntelliSense).