Replaced those UI objects with the effect's object and it does not work. Though thanks for this scaling technique, I will keep it in mind!
You might have misunderstood this problem.
The effect itself is like zooming-in on mobile. When it looks good on PC, when trying out on mobile the effect is zoomed inside. What I am looking for is that it looks exactly the same on mobile too. Like all other non-effect sprites.
This also applies to other effects. Maybe all
The effect I am using is here effect-rotated-rays-fx_t149470