fix: update

src/app/ControlPage/control/control.component.css

-app-element-term {
+app-element-term, div {
   height: 100%;
   display: none;
 }
 
-app-element-term.active {
+.active {
   display: block;
 }

src/app/ControlPage/control/control.component.html

 <app-controlnav></app-controlnav>
 <!--<app-ssh></app-ssh>-->
 <!--<app-rdp></app-rdp>-->
-<div *ngFor="let m of NavList.List;let i=index">
+<div *ngFor="let m of NavList.List;let i=index"
+     [ngClass]="{'active':i==NavList.Active}"
+>
   <app-element-term [host]="m.host"
                     [userid]="m.user.id"
                     [index]="i"