In settings.json change below code:-
"workbench.colorCustomizations": {
// Changes the default text color of the sidebar/explorer
"": "#758b7c",
"sideBar.foreground":"default",
// Changes the text color of the currently selected/focused file
"list.focusForeground": "#FFD700",
"menu.foreground":"#020202",
// Changes the text color of active files or items when hovering
"list.activeSelectionForeground": "#8400ff31",
"list.hoverForeground": "#6e0ad2",
"menu.selectionForeground": "#FFFFFF",
"menu.selectionBackground": "#be1919c6"
}