how do you put a book case in a wall niche?

Modern Design Homes 27 March 2023

How to put a book case in a hollow wall? 

I have spent my whole day firuring it out but it looks so bad. 

I am attaching some pics in the comments so you all have an idea on what  am saying. 

Any advice is appreciate!!

Thank You 

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Homestyler Official 30 March 2023
When moving the bookcase, press and hold ctrl to cooperate with the movement, and it can be easily placed in the alcove.