So we make use of the portal version: 10.6.1
So for example: When I as an user want to add a new layer to the map using the following method: Add > Search for Layer: Every thumb turn out to be pink (check the picture). It is the same in my content.
The only thing I could think of was an adjustment I had to in ArcGIS-Pro before publishing the data. Is there a way to change this in general in Portal?