diff --git a/src/atlasViewer/atlasViewer.component.ts b/src/atlasViewer/atlasViewer.component.ts
index 6c4061386ea4178d3cca27e0b9c2892bf1ae98ac..30d2353b5ca0b71dbccca9ab7f1ebc0135ab4aad 100644
--- a/src/atlasViewer/atlasViewer.component.ts
+++ b/src/atlasViewer/atlasViewer.component.ts
@@ -374,8 +374,12 @@ export class AtlasViewer implements OnDestroy, OnInit, AfterViewInit {
     )
   }
 
-  public bindFn(fn, arg){
-    return () => fn(arg)
+  public bindFns(fns){
+    return () => {
+      for (const [ fn, ...arg] of fns) {
+        fn(...arg)
+      }
+    }
   }
 
   public clearAdditionalLayer(layer: { ['@id']: string }){
diff --git a/src/atlasViewer/atlasViewer.template.html b/src/atlasViewer/atlasViewer.template.html
index ebc678e829a5b26c13620c57278b6a142a590519..1373f74d6e65fcd1e0c7b6d41651f3de5ae3c40a 100644
--- a/src/atlasViewer/atlasViewer.template.html
+++ b/src/atlasViewer/atlasViewer.template.html
@@ -111,7 +111,9 @@
 
           <ng-template #currParcellationTmpl let-parc="parc" let-addParc="addParc">
 
-            <div [matMenuTriggerFor]="layerVersionMenu" #layerVersionMenuTrigger="matMenuTrigger">
+            <div [matMenuTriggerFor]="layerVersionMenu"
+              [matMenuTriggerData]="{ layerVersionMenuTrigger: layerVersionMenuTrigger }"
+              #layerVersionMenuTrigger="matMenuTrigger">
 
               <ng-template [ngIf]="addParc.length > 0" [ngIfElse]="defaultParcTmpl">
                 <ng-container *ngFor="let p of addParc">
@@ -142,7 +144,7 @@
             let-selected="selected"
             let-dismissable="dismissable"
             let-onclick="onclick">
-            <mat-chip class="pe-all" (click)="onclick && onclick()" [selected]="selected">
+            <mat-chip class="pe-all position-relative z-index-2" (click)="onclick && onclick()" [selected]="selected">
               
               {{ parcel?.groupName ? (parcel?.groupName + ' - ') : '' }}{{ parcel?.name }}
 
@@ -187,17 +189,23 @@
           </ng-template>
 
           <!-- layer version selector -->
-          <mat-menu #layerVersionMenu>
-            <ng-container *ngFor="let parcVer of selectedLayerVersions$ | async">
-              <ng-container *ngTemplateOutlet="chipTmpl; context: {
-                parcel: parcVer,
-                selected: selectedParcellation && selectedParcellation['@id'] === parcVer['@id'],
-                dismissable: false,
-                onclick: bindFn(selectParcellation.bind(this), parcVer)
-              }">
+          <mat-menu #layerVersionMenu class="bg-none">
+            <ng-template matMenuContent let-layerVersionMenuTrigger="layerVersionMenuTrigger">
+
+              <ng-container *ngFor="let parcVer of selectedLayerVersions$ | async">
+                <ng-container *ngTemplateOutlet="chipTmpl; context: {
+                  parcel: parcVer,
+                  selected: selectedParcellation && selectedParcellation['@id'] === parcVer['@id'],
+                  dismissable: false,
+                  onclick: bindFns([
+                    [ selectParcellation.bind(this), parcVer ],
+                    [ layerVersionMenuTrigger.closeMenu.bind(layerVersionMenuTrigger) ]
+                  ])
+                }">
+                </ng-container>
+                <div class="mt-1"></div>
               </ng-container>
-              <div class="mt-1"></div>
-            </ng-container>
+            </ng-template>
           </mat-menu>
 
           <ng-template #selectedRegionTmpl>
@@ -208,14 +216,14 @@
                 iav-region
                 (click)="uiNehubaContainer.matDrawerMinor.open() && uiNehubaContainer.navSideDrawerMainSwitch.open()"
                 [region]="r"
-                class="pe-all position-relative z-index-1"
+                class="pe-all position-relative z-index-1 ml-8-n"
                 [ngClass]="{
                   'darktheme':regionDirective.rgbDarkmode === true,
                   'lighttheme': regionDirective.rgbDarkmode === false
                 }"
                 [style.backgroundColor]="regionDirective.rgbString"
                 #regionDirective="iavRegion">
-                <span class="iv-custom-comp text text-truncate d-inline">
+                <span class="iv-custom-comp text text-truncate d-inline pl-4">
                   {{ r.name }}
                 </span>
                 <mat-icon
diff --git a/src/res/css/extra_styles.css b/src/res/css/extra_styles.css
index c541717c4814689796b2461bde2cf319e0d2b6d7..29150dca0832a5d75c61db7d41c2e5056b3da75f 100644
--- a/src/res/css/extra_styles.css
+++ b/src/res/css/extra_styles.css
@@ -493,6 +493,10 @@ markdown-dom pre code
 {
   z-index: 1!important;
 }
+.z-index-2
+{
+  z-index: 2!important;
+}
 .z-index-6
 {
   z-index: 6!important;
diff --git a/src/services/state/viewerState.store.ts b/src/services/state/viewerState.store.ts
index 33750d0d517e7e95b0c23f8c2ec29408c90a95cf..eb1005074da257b2fa07069bf4a2abca2b9d2c67 100644
--- a/src/services/state/viewerState.store.ts
+++ b/src/services/state/viewerState.store.ts
@@ -259,7 +259,7 @@ export const NEWVIEWER = 'NEWVIEWER'
 export const FETCHED_TEMPLATE = 'FETCHED_TEMPLATE'
 export const CHANGE_NAVIGATION = 'CHANGE_NAVIGATION'
 
-export const SELECT_PARCELLATION = `SELECT_PARCELLATION`
+export const SELECT_PARCELLATION = viewerStateSelectParcellation.type
 
 export const DESELECT_REGIONS = `DESELECT_REGIONS`
 export const SELECT_REGIONS = `SELECT_REGIONS`
diff --git a/src/ui/nehubaContainer/nehubaContainer.template.html b/src/ui/nehubaContainer/nehubaContainer.template.html
index a8575e9acc833c3b2149c875fa64b0ac08200ee1..a101fd063b4a31ef79e4d91c9b36bf46cdd2c061 100644
--- a/src/ui/nehubaContainer/nehubaContainer.template.html
+++ b/src/ui/nehubaContainer/nehubaContainer.template.html
@@ -66,8 +66,21 @@
         [attr.aria-label]="ARIA_LABEL_EXPAND"
         (click)="matDrawerMinor.open()"
         class="explore-btn pe-all"
-        color="accent">
-        Explore
+        [ngClass]="{
+          'darktheme': iavRegion.rgbDarkmode === true,
+          'lighttheme': iavRegion.rgbDarkmode === false
+        }"
+        [style.backgroundColor]="iavRegion?.rgbString || 'accent'">
+        <span>
+          Explore
+        </span>
+
+        <div class="hidden"
+          iav-region
+          [region]="(selectedRegions$ | async) && (selectedRegions$ | async)[0]"
+          #iavRegion="iavRegion">
+        </div>
+
       </button>
     </mat-drawer>
     <mat-drawer-content class="visible position-relative">
diff --git a/src/ui/viewerStateController/viewerState.useEffect.ts b/src/ui/viewerStateController/viewerState.useEffect.ts
index c3605d204b5eaf8343740b9f99a3111856141550..260b562b6a9988c1b4f4ddddeaccee93ac30d06f 100644
--- a/src/ui/viewerStateController/viewerState.useEffect.ts
+++ b/src/ui/viewerStateController/viewerState.useEffect.ts
@@ -2,11 +2,9 @@ import { Injectable, OnDestroy } from "@angular/core";
 import { Actions, Effect, ofType } from "@ngrx/effects";
 import { Action, select, Store } from "@ngrx/store";
 import { Observable, Subscription, of, merge } from "rxjs";
-import {distinctUntilChanged, filter, map, shareReplay, withLatestFrom, switchMap, mapTo, tap } from "rxjs/operators";
+import {distinctUntilChanged, filter, map, shareReplay, withLatestFrom, switchMap, mapTo } from "rxjs/operators";
 import { AtlasViewerConstantsServices } from "src/atlasViewer/atlasViewer.constantService.service";
-import { CHANGE_NAVIGATION, FETCHED_TEMPLATE, GENERAL_ACTION_TYPES, IavRootStoreInterface, isDefined, NEWVIEWER, SELECT_PARCELLATION, SELECT_REGIONS } from "src/services/stateStore.service";
-import { UIService } from "src/services/uiService.service";
-import { regionFlattener } from "src/util/regionFlattener";
+import { CHANGE_NAVIGATION, FETCHED_TEMPLATE, GENERAL_ACTION_TYPES, IavRootStoreInterface, NEWVIEWER, SELECT_PARCELLATION, SELECT_REGIONS } from "src/services/stateStore.service";
 import { VIEWERSTATE_CONTROLLER_ACTION_TYPES } from "./viewerState.base";
 import {TemplateCoordinatesTransformation} from "src/services/templateCoordinatesTransformation.service";
 import { CLEAR_STANDALONE_VOLUMES } from "src/services/state/viewerState.store";