diff --git a/src/display/editor/tools.js b/src/display/editor/tools.js
index 819081046ab473..cf7f297e957823 100644
--- a/src/display/editor/tools.js
+++ b/src/display/editor/tools.js
@@ -1296,6 +1296,17 @@ class AnnotationEditorUIManager {
         source: this,
         details: Object.assign(this.#previousStates, details),
       });
+      // We could listen on our own event but it sounds like a bit weird and
+      // it's a way to simpler to handle that stuff here instead of having to
+      // add something in every place where an editor can be unselected.
+      if (
+        this.#mode === AnnotationEditorType.HIGHLIGHT &&
+        details.hasSelectedEditor === false
+      ) {
+        this.#dispatchUpdateUI([
+          [AnnotationEditorParamsType.HIGHLIGHT_FREE, true],
+        ]);
+      }
     }
   }
 
diff --git a/test/integration/highlight_editor_spec.mjs b/test/integration/highlight_editor_spec.mjs
index e67a35eaa71e3b..0d47758117c7b7 100644
--- a/test/integration/highlight_editor_spec.mjs
+++ b/test/integration/highlight_editor_spec.mjs
@@ -1231,4 +1231,67 @@ describe("Highlight Editor", () => {
       );
     });
   });
+
+  describe("Thickness must be enabled when there's no selected highlights", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait("tracemonkey.pdf", ".annotationEditorLayer");
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("must check the thickness input state", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.click("#editorHighlight");
+          await page.waitForSelector(".annotationEditorLayer.highlightEditing");
+
+          let rect = await getSpanRectFromText(page, 1, "Abstract");
+          await page.mouse.click(
+            rect.x + rect.width / 2,
+            rect.y + rect.height / 2,
+            { count: 2, delay: 100 }
+          );
+
+          await page.waitForSelector(getEditorSelector(0));
+
+          rect = await page.$eval(".annotationEditorLayer", el => {
+            const { x, y } = el.getBoundingClientRect();
+            return { x, y };
+          });
+
+          const clickHandle = await waitForPointerUp(page);
+          await page.mouse.move(rect.x + 120, rect.y + 120);
+          await page.mouse.down();
+          await page.mouse.move(rect.x + 220, rect.y + 220);
+          await page.mouse.up();
+          await awaitPromise(clickHandle);
+
+          await page.waitForSelector(getEditorSelector(1));
+          await page.waitForSelector(
+            "#editorFreeHighlightThickness:not([disabled])"
+          );
+
+          await page.click(getEditorSelector(0));
+          await page.waitForSelector(getEditorSelector(0));
+          await page.waitForSelector("#editorFreeHighlightThickness[disabled]");
+
+          await page.click("#editorHighlight");
+          await page.waitForSelector(
+            ".annotationEditorLayer:not(.highlightEditing)"
+          );
+
+          await page.click("#editorHighlight");
+          await page.waitForSelector(".annotationEditorLayer.highlightEditing");
+
+          await page.waitForSelector(
+            "#editorFreeHighlightThickness:not([disabled])"
+          );
+        })
+      );
+    });
+  });
 });