On several of our workstations equipped with SW 2018 SP4, it happens very often (several times a day) that the "Dynamic highlighting of the graphic view" box is unchecked by itself. This problem was already recurrent in SW 2015.
Has anyone ever encountered and solved this problem?
You could also check if a filter was not inadvertently set (Enable the filter of the FeatureManager tree)
Look here, a colleague seems to have found a solutionhttps://www.lynkoa.com/forum/import-export-formats-neutres/plus-daffichage-des-ar%c3%a8tes-au-survol-souris
Digging a little deeper, I read this
Dynamic Graphical View Highlighting
Faces, edges, and vertices are highlighted when you move the pointer over a sketch, model, or drawing. (This option is only available when Complex Assembly Mode is enabled.)
It's here towards the bottom of the Help http://help.solidworks.com/2014/French/SolidWorks/sldworks/HIDD_OPTIONS_EDGES.htm.