I've developed tons of Retool apps over the past 4 years or so and I never got my head around why ever Retool app felt the exact same regardless of theme.
I think its because of default container and canvas padding. In this example I set the padding to 320 px and to me it no longer feels like a Retool app but a normal portal.
"Great observation! Adjusting the padding makes a huge difference—it gives the app a more polished and distinct feel, breaking away from the default Retool look. Subtle design tweaks like this can significantly elevate the user experience!"