diff --git a/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalInput.vue b/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalInput.vue
index bccb83c72b632..52bac85329ceb 100644
--- a/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalInput.vue
+++ b/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalInput.vue
@@ -1,5 +1,5 @@
 <template>
-	<div ref="root" @keydown.stop></div>
+	<div ref="root" :class="$style.editor" @keydown.stop></div>
 </template>
 
 <script lang="ts">
@@ -67,6 +67,7 @@ export default defineComponent({
 			history(),
 			expressionInputHandler(),
 			EditorView.lineWrapping,
+			EditorView.editable.of(!this.isReadOnly),
 			EditorState.readOnly.of(this.isReadOnly),
 			EditorView.contentAttributes.of({ 'data-gramm': 'false' }), // disable grammarly
 			EditorView.domEventHandlers({ scroll: forceParse }),
@@ -146,4 +147,14 @@ export default defineComponent({
 });
 </script>
 
-<style lang="scss"></style>
+<style lang="scss" module>
+.editor div[contenteditable='false'] {
+	background-color: var(--disabled-fill, var(--color-background-light));
+	cursor: not-allowed;
+}
+</style>
+<style lang="scss" scoped>
+:deep(.cm-content) {
+	border-radius: var(--border-radius-base);
+}
+</style>
diff --git a/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalOutput.vue b/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalOutput.vue
index de1d60abecf43..0f79ef4ee6faf 100644
--- a/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalOutput.vue
+++ b/packages/editor-ui/src/components/ExpressionEditorModal/ExpressionEditorModalOutput.vue
@@ -75,6 +75,7 @@ export default defineComponent({
 			outputTheme(),
 			EditorState.readOnly.of(true),
 			EditorView.lineWrapping,
+			EditorView.editable.of(false),
 			EditorView.domEventHandlers({ scroll: forceParse }),
 		];
 
diff --git a/packages/editor-ui/src/components/ExpressionParameterInput.vue b/packages/editor-ui/src/components/ExpressionParameterInput.vue
index 091c04e26621a..be5a0f7ef81be 100644
--- a/packages/editor-ui/src/components/ExpressionParameterInput.vue
+++ b/packages/editor-ui/src/components/ExpressionParameterInput.vue
@@ -20,8 +20,11 @@
 				@blur="onBlur"
 				@change="onChange"
 			/>
-			<n8n-icon
+			<n8n-button
 				v-if="!isDragging"
+				square
+				outline
+				type="tertiary"
 				icon="external-link-alt"
 				size="xsmall"
 				:class="$style['expression-editor-modal-opener']"
@@ -185,27 +188,21 @@ export default defineComponent({
 	background-color: var(--color-code-background);
 	padding: 3px;
 	line-height: 9px;
-	border: var(--border-base);
-	border-top-left-radius: var(--border-radius-base);
-	border-bottom-right-radius: var(--input-border-bottom-right-radius, var(--border-radius-base));
-	border-right-color: var(
-		--input-border-right-color,
-		var(--input-border-color, var(--border-color-base))
-	);
-	border-bottom-color: var(
-		--input-border-bottom-color,
-		var(--input-border-color, var(--border-color-base))
-	);
+	border: var(--input-border-color, var(--border-color-base))
+		var(--input-border-style, var(--border-style-base))
+		var(--input-border-width, var(--border-width-base));
 	cursor: pointer;
 
+	&:hover {
+		border: var(--input-border-color, var(--border-color-base))
+			var(--input-border-style, var(--border-style-base))
+			var(--input-border-width, var(--border-width-base));
+	}
+
 	svg {
 		width: 9px !important;
 		height: 9px;
 		transform: rotate(270deg);
-
-		&:hover {
-			color: var(--color-primary);
-		}
 	}
 }
 
diff --git a/packages/editor-ui/src/components/InlineExpressionEditor/InlineExpressionEditorInput.vue b/packages/editor-ui/src/components/InlineExpressionEditor/InlineExpressionEditorInput.vue
index a4deef2bc6828..d436f60954a0f 100644
--- a/packages/editor-ui/src/components/InlineExpressionEditor/InlineExpressionEditorInput.vue
+++ b/packages/editor-ui/src/components/InlineExpressionEditor/InlineExpressionEditorInput.vue
@@ -1,5 +1,5 @@
 <template>
-	<div ref="root" data-test-id="inline-expression-editor-input"></div>
+	<div ref="root" :class="$style.editor" data-test-id="inline-expression-editor-input"></div>
 </template>
 
 <script lang="ts">
@@ -169,4 +169,18 @@ export default defineComponent({
 });
 </script>
 
-<style lang="scss"></style>
+<style lang="scss" module>
+.editor div[contenteditable='false'] {
+	background-color: var(--disabled-fill, var(--color-background-light));
+	cursor: not-allowed;
+}
+</style>
+
+<style lang="scss" scoped>
+:deep(.cm-editor) {
+	padding-left: 0;
+}
+:deep(.cm-content) {
+	padding-left: var(--spacing-2xs);
+}
+</style>
diff --git a/packages/editor-ui/src/components/__tests__/ExpressionEditorModalInput.test.ts b/packages/editor-ui/src/components/__tests__/ExpressionEditorModalInput.test.ts
new file mode 100644
index 0000000000000..3793d3d760483
--- /dev/null
+++ b/packages/editor-ui/src/components/__tests__/ExpressionEditorModalInput.test.ts
@@ -0,0 +1,39 @@
+import userEvent from '@testing-library/user-event';
+import { createComponentRenderer } from '@/__tests__/render';
+import ExpressionEditorModalInput from '@/components/ExpressionEditorModal/ExpressionEditorModalInput.vue';
+
+const renderComponent = createComponentRenderer(ExpressionEditorModalInput);
+
+const originalRangeGetBoundingClientRect = Range.prototype.getBoundingClientRect;
+const originalRangeGetClientRects = Range.prototype.getClientRects;
+
+describe('ExpressionParameterInput', () => {
+	beforeAll(() => {
+		Range.prototype.getBoundingClientRect = vi.fn();
+		Range.prototype.getClientRects = () => ({
+			item: vi.fn(),
+			length: 0,
+			[Symbol.iterator]: vi.fn(),
+		});
+	});
+
+	afterAll(() => {
+		Range.prototype.getBoundingClientRect = originalRangeGetBoundingClientRect;
+		Range.prototype.getClientRects = originalRangeGetClientRects;
+	});
+	test.each([
+		['not be editable', 'readonly', true, ''],
+		['be editable', 'not readonly', false, 'test'],
+	])('should %s when %s', async (_, __, isReadOnly, expected) => {
+		const { getByRole } = renderComponent({
+			props: {
+				modelValue: '',
+				path: '',
+				isReadOnly,
+			},
+		});
+
+		await userEvent.type(getByRole('textbox'), 'test');
+		expect(getByRole('textbox')).toHaveTextContent(expected);
+	});
+});
diff --git a/packages/editor-ui/src/components/__tests__/ExpressionParameterInput.test.ts b/packages/editor-ui/src/components/__tests__/ExpressionParameterInput.test.ts
new file mode 100644
index 0000000000000..43e5d73eb8b9b
--- /dev/null
+++ b/packages/editor-ui/src/components/__tests__/ExpressionParameterInput.test.ts
@@ -0,0 +1,36 @@
+import { createPinia, setActivePinia } from 'pinia';
+import userEvent from '@testing-library/user-event';
+import { createComponentRenderer } from '@/__tests__/render';
+import { useWorkflowsStore } from '@/stores/workflows.store';
+import { useNDVStore } from '@/stores/ndv.store';
+import ExpressionParameterInput from '@/components/ExpressionParameterInput.vue';
+
+const renderComponent = createComponentRenderer(ExpressionParameterInput);
+
+let pinia: ReturnType<typeof createPinia>;
+let workflowsStore: ReturnType<typeof useWorkflowsStore>;
+let ndvStore: ReturnType<typeof useNDVStore>;
+
+describe('ExpressionParameterInput', () => {
+	beforeEach(() => {
+		pinia = createPinia();
+		setActivePinia(pinia);
+		workflowsStore = useWorkflowsStore();
+		ndvStore = useNDVStore();
+	});
+
+	test.each([
+		['not readonly', false, expect.anything()],
+		['readonly', true, expect.anything()],
+	])('should emit open expression editor modal when %s', async (_, isReadOnly, expected) => {
+		const { getByTestId, emitted } = renderComponent({
+			props: {
+				modelValue: '',
+				isReadOnly,
+			},
+		});
+
+		await userEvent.click(getByTestId('expander'));
+		expect(emitted().modalOpenerClick).toEqual(expected);
+	});
+});