diff --git a/test/functional/apps/discover/group2/_data_grid_copy_to_clipboard.ts b/test/functional/apps/discover/group2/_data_grid_copy_to_clipboard.ts
index fb759bc53099d..06fe279dbd534 100644
--- a/test/functional/apps/discover/group2/_data_grid_copy_to_clipboard.ts
+++ b/test/functional/apps/discover/group2/_data_grid_copy_to_clipboard.ts
@@ -64,7 +64,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
 
       if (canReadClipboard) {
         const copiedSourceData = await browser.getClipboardValue();
-        expect(copiedSourceData.startsWith('"_source"\n{"@message":["238.171.34.42')).to.be(true);
+        expect(copiedSourceData.startsWith('Document\n{"@message":["238.171.34.42')).to.be(true);
         expect(copiedSourceData.endsWith('}')).to.be(true);
       }
 
@@ -89,7 +89,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
 
       if (canReadClipboard) {
         const copiedSourceName = await browser.getClipboardValue();
-        expect(copiedSourceName).to.be('"_source"');
+        expect(copiedSourceName).to.be('Document');
       }
 
       expect(await toasts.getToastCount()).to.be(1);
diff --git a/test/functional/apps/discover/group2/index.ts b/test/functional/apps/discover/group2/index.ts
index 54854a5243365..d6a0aeb9cd9ec 100644
--- a/test/functional/apps/discover/group2/index.ts
+++ b/test/functional/apps/discover/group2/index.ts
@@ -13,7 +13,7 @@ export default function ({ getService, loadTestFile }: FtrProviderContext) {
 
   describe('discover/group2', function () {
     before(async function () {
-      await browser.setWindowSize(1300, 800);
+      await browser.setWindowSize(1600, 1200);
     });
 
     after(async function unloadMakelogs() {
diff --git a/test/functional/screenshots/baseline/area_chart.png b/test/functional/screenshots/baseline/area_chart.png
index 5f3e3e7238dfd..b60760eb460d4 100644
Binary files a/test/functional/screenshots/baseline/area_chart.png and b/test/functional/screenshots/baseline/area_chart.png differ
diff --git a/test/functional/services/remote/webdriver.ts b/test/functional/services/remote/webdriver.ts
index af2e1056e6867..636391f790f1e 100644
--- a/test/functional/services/remote/webdriver.ts
+++ b/test/functional/services/remote/webdriver.ts
@@ -99,9 +99,12 @@ function initChromiumOptions(browserType: Browsers, acceptInsecureCerts: boolean
   }
 
   if (headlessBrowser === '1') {
+    // Using the new headless mode (instead of `options.headless()`)
+    // See: https://www.selenium.dev/blog/2023/headless-is-going-away/
+    options.addArguments('headless=new');
+
     // Use --disable-gpu to avoid an error from a missing Mesa library, as per
     // See: https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md
-    options.headless();
     options.addArguments('disable-gpu');
   }
 
@@ -111,7 +114,11 @@ function initChromiumOptions(browserType: Browsers, acceptInsecureCerts: boolean
 
   if (remoteDebug === '1') {
     // Visit chrome://inspect in chrome to remotely view/debug
-    options.headless();
+
+    // Using the new headless mode (instead of `options.headless()`)
+    // See: https://www.selenium.dev/blog/2023/headless-is-going-away/
+    options.addArguments('headless=new');
+
     options.addArguments('disable-gpu', 'remote-debugging-port=9222');
   }
 
diff --git a/x-pack/test/functional/apps/infra/hosts_view.ts b/x-pack/test/functional/apps/infra/hosts_view.ts
index 86ac3ee90eeb5..28686f9b3d7fe 100644
--- a/x-pack/test/functional/apps/infra/hosts_view.ts
+++ b/x-pack/test/functional/apps/infra/hosts_view.ts
@@ -160,6 +160,7 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
         esArchiver.load('x-pack/test/functional/es_archives/infra/metrics_hosts_processes'),
         kibanaServer.savedObjects.cleanStandardList(),
       ]);
+      await browser.setWindowSize(1600, 1200);
     });
 
     after(() => {
diff --git a/x-pack/test/functional/apps/maps/group1/blended_vector_layer.js b/x-pack/test/functional/apps/maps/group1/blended_vector_layer.js
index 67e6d7f93a4cd..28a68edf0e75c 100644
--- a/x-pack/test/functional/apps/maps/group1/blended_vector_layer.js
+++ b/x-pack/test/functional/apps/maps/group1/blended_vector_layer.js
@@ -35,7 +35,7 @@ export default function ({ getPageObjects, getService }) {
     it('should request clusters when zoomed to larger regions showing lots of data', async () => {
       await PageObjects.maps.setView(20, -90, 2);
       const { rawResponse: response } = await PageObjects.maps.getResponse();
-      expect(response.aggregations.gridSplit.buckets.length).to.equal(17);
+      expect(response.aggregations.gridSplit.buckets.length).to.equal(15);
     });
 
     it('should request documents when query narrows data', async () => {
diff --git a/x-pack/test/functional/apps/maps/group1/documents_source/search_hits.js b/x-pack/test/functional/apps/maps/group1/documents_source/search_hits.js
index 75649a23f68bf..0273441f3543e 100644
--- a/x-pack/test/functional/apps/maps/group1/documents_source/search_hits.js
+++ b/x-pack/test/functional/apps/maps/group1/documents_source/search_hits.js
@@ -120,7 +120,7 @@ export default function ({ getPageObjects, getService }) {
         const { lat, lon, zoom } = await PageObjects.maps.getView();
         expect(Math.round(lat)).to.equal(43);
         expect(Math.round(lon)).to.equal(-102);
-        expect(Math.round(zoom)).to.equal(5);
+        expect(Math.round(zoom)).to.equal(4);
       });
     });
 
diff --git a/x-pack/test/functional/apps/maps/group2/es_geo_grid_source.js b/x-pack/test/functional/apps/maps/group2/es_geo_grid_source.js
index f38d1928aab52..49c31f951d3d3 100644
--- a/x-pack/test/functional/apps/maps/group2/es_geo_grid_source.js
+++ b/x-pack/test/functional/apps/maps/group2/es_geo_grid_source.js
@@ -53,7 +53,7 @@ export default function ({ getPageObjects, getService }) {
         });
 
         it('should not rerequest when pan changes do not move map view area outside of buffer', async () => {
-          await PageObjects.maps.setView(DATA_CENTER_LAT + 10, DATA_CENTER_LON + 10, 1);
+          await PageObjects.maps.setView(DATA_CENTER_LAT + 5, DATA_CENTER_LON + 5, 1);
           const afterTimestamp = await getRequestTimestamp();
           expect(afterTimestamp).to.equal(beforeTimestamp);
         });
diff --git a/x-pack/test/functional/screenshots/baseline/flights_map.png b/x-pack/test/functional/screenshots/baseline/flights_map.png
index dd4f9f4809504..fa63492c31858 100644
Binary files a/x-pack/test/functional/screenshots/baseline/flights_map.png and b/x-pack/test/functional/screenshots/baseline/flights_map.png differ
diff --git a/x-pack/test/functional/screenshots/baseline/web_logs_map.png b/x-pack/test/functional/screenshots/baseline/web_logs_map.png
index c2cfaaf847030..77e84c339f3dc 100644
Binary files a/x-pack/test/functional/screenshots/baseline/web_logs_map.png and b/x-pack/test/functional/screenshots/baseline/web_logs_map.png differ