Temporarily you can lay a thin bead of caulking it will come off both the fridge and counter cleanly. Not seeing the issue and possible space it's difficult to advise you further. Possible to take a picture?

Hello Gopa, You can do a partition with plywood on wooden frame. Go for a door with hinges as there is no benefit of a sliding door in terms of light . What is your intent for having a openable vs sliding door. Please be aware that after making an additional room the living room will look dark and long/ narrow. You can have a transome on the door in case privacy is not much of an issue. You will however have to depend on artificial lighting in case a full partition is done. Thanks Amit Cornerstone Designs Bangalore

Krishna, You can opt for stone carcass and/or metal shutters (Steel and aluminum). Do you live in a flood prone area ? Thanks, Nitin Cornerstone Designs, Bangalore.

Hi, there. Your layout sure looks perfect, we would advise you not to make any changes in the plan. But, in the 3D render image we would suggest you to either push the fridge to a lil bit right or left, so you can get a continuous line of upper storage. It would make a good look for the kitchen. Thank you.