Dear Shifu, I realised that my main door faces the windows. Should I cover the windows completely to avoid loss of qi or the windows could remain closed?

Some units at a quite recent TOP condo Queens Peak at Queenstown, is similar.

Can certainly have light in. 
If the windows “flip” from the bottom up, best still to close the windows. 

Don’t have to make this area dark especially with night curtains. Bright or a blind is acceptable.