correcting protruding corners

[myfs_94367]

Dear Mr Cecil,

Thank you for providing us fengshui believers an ocean of knowledge through this forum.

Please suggest a method to correct protruding corners as the west & northwest areas of my apartment have big extensions as shown in the attachment.

Please advice as what objects can be used to seemingly cut the extended areas from the rest of apartment& method to do so

Please reply

Thank you

Regards