diff --git a/backend/frontend/index.html b/backend/frontend/index.html
index 4e2eafe..1bacab4 100644
--- a/backend/frontend/index.html
+++ b/backend/frontend/index.html
@@ -4,7 +4,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Admin Operations Center</title>
-  <link rel="stylesheet" href="/style.css?v=10" />
+  <link rel="stylesheet" href="/style.css?v=11" />
   <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
   <script src="https://alcdn.msauth.net/browser/2.37.0/js/msal-browser.min.js" crossorigin="anonymous"></script>
 </head>
@@ -184,7 +184,11 @@
               <template x-for="(evt, idx) in askEvents" :key="evt.id || idx">
                 <article class="event event--compact">
                   <div class="event__meta">
-                    <span class="pill pill--clickable" x-text="evt.display_category || evt.service || '—'" @click="filterByService(evt.service || evt.display_category)" title="Filter by this service"></span>
+                    <span class="pill">
+                <span x-text="evt.display_category || evt.service || '—'"></span>
+                <span class="pill__action" @click.stop="addServiceFilter(evt.service || evt.display_category)" title="Include this service">+</span>
+                <span class="pill__action" @click.stop="removeServiceFilter(evt.service || evt.display_category)" title="Exclude this service">−</span>
+              </span>
                     <span class="pill pill--clickable" :class="['success','succeeded','ok','passed','true'].includes((evt.result || '').toLowerCase()) ? 'pill--ok' : 'pill--warn'" x-text="evt.result || '—'" @click="filterByResult(evt.result)" title="Filter by this result"></span>
                   </div>
                   <h3 x-text="evt.operation || '—'"></h3>
@@ -670,13 +674,19 @@
           this.loadEvents();
         },
 
-        filterByService(service) {
+        addServiceFilter(service) {
           if (!service) return;
           if (!this.filters.selectedServices.includes(service)) {
-            this.filters.selectedServices = [service];
-          } else {
-            this.filters.selectedServices = this.filters.selectedServices.filter((s) => s !== service);
+            this.filters.selectedServices.push(service);
+            this.saveFilters();
+            this.resetPagination();
+            this.loadEvents();
           }
+        },
+
+        removeServiceFilter(service) {
+          if (!service) return;
+          this.filters.selectedServices = this.filters.selectedServices.filter((s) => s !== service);
           this.saveFilters();
           this.resetPagination();
           this.loadEvents();
diff --git a/backend/frontend/style.css b/backend/frontend/style.css
index ebb07b1..693e689 100644
--- a/backend/frontend/style.css
+++ b/backend/frontend/style.css
@@ -376,6 +376,31 @@ input {
   background: rgba(249, 115, 22, 0.25);
 }
 
+.pill__action {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  height: 16px;
+  border-radius: 4px;
+  margin-left: 4px;
+  font-size: 11px;
+  font-weight: 700;
+  line-height: 1;
+  cursor: pointer;
+  color: var(--muted);
+  background: rgba(255, 255, 255, 0.06);
+  border: 1px solid transparent;
+  transition: all 0.12s ease;
+  vertical-align: middle;
+}
+
+.pill__action:hover {
+  color: var(--text);
+  background: rgba(125, 211, 252, 0.2);
+  border-color: rgba(125, 211, 252, 0.3);
+}
+
 .event h3 {
   margin: 0 0 6px;
   font-size: 17px;