I found a solution i just add a condition in app.tsx

const basePath = '/app'; // sub floder

// Intercept all Inertia requests to enforce the correct prefix
router.on('start', ({ detail: { visit } }) => {
    const path = visit.url.pathname;

//add prefix if needed
   if (path.startsWith('/') && !path.startsWith(basePath)) {
        visit.url.pathname = basePath + path;
    }
});