After upgrading my QGIS version to QGIS 3.6.2, I am facing several issues in the print composer:
Symbol sizes don't show anymore in the legends. If I open the same files again in version 2.18, where symbol sizes showed, I have to re-define the symbol sizes for all the zillion layers I have. So that is not really an option.
When I try to filter legend items based on what is shown on the map, the program simply crashes.
How can I show symbols sizes in the legend of a composer in version 3.6.2, and how can I only show the legend of the items currently shown on the map?