Suggestion for future updates
Keep all classes for jqGrid in ui.jqgrid.css instead of using classes from other sources. I’m using JQuery and JQuery-UI (which I fixed to work with JQuery 3.5.1). The issue is the use of JQuery-UI styles in jqGrid. This results in cascading styles and is difficult to get a consistent look in both JQuery UI and jqGrid.
The look is affected by the order in which jqGrid adds styles, the order of styles in the style sheet, and also the order of the style sheets in the page. I spent a lot of time looking at both JQuery-UI and jqGrid output then changing/combining/deleting styles. The end result is consistency and smaller style sheets.