Should I refrigerate vegetables in sealed bag or not?
It depends. Some fridges have a special area to store vegetables where they control the air flow and temperature in order to control moisture and humidity.

If your fridge is one of these, then removing them from the sealed bags is not a bad idea.

However, if you don't have such an area the vegetables are likely to dry or to get cold burns depending on your fridge settings, so keeping them packaged can help avoid that.

It is also important to notice that keeping things tidy and in separate containers in a fridge helps with higiene and keeps harmful bacteria from damaged products to latch onto newer ones.

Hope it helps.