diff --git a/arduino-ide-extension/src/browser/contributions/open-sketch-files.ts b/arduino-ide-extension/src/browser/contributions/open-sketch-files.ts
index 01fa997d3..86cf971d0 100644
--- a/arduino-ide-extension/src/browser/contributions/open-sketch-files.ts
+++ b/arduino-ide-extension/src/browser/contributions/open-sketch-files.ts
@@ -45,7 +45,11 @@ export class OpenSketchFiles extends SketchContribution {
         await this.ensureOpened(uri);
       }
       if (focusMainSketchFile) {
-        await this.ensureOpened(mainFileUri, true, { mode: 'activate' });
+        await this.ensureOpened(mainFileUri, true, {
+          mode: 'activate',
+          preview: false,
+          counter: 0,
+        });
       }
       if (mainFileUri.endsWith('.pde')) {
         const message = nls.localize(