How do you fix a bifold closet door that won’t close all the way?

Check hinges are not too tight on doors. Loosen off and re-aline wheel pulley on track and re- tighten.

Throw them in the trash! OR, make them into french doors, use straps to make each bifold into 1 door, take out track in the middle so doors will open up like french doors, you can use a magnent at top middle to make them close in the middle.

I'm doing this now, i'll send a pic when done. hopefully today..

make sure that the hinges have been counter sunk properly eric

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Second thoughts, Maybe you need to sprsy the tracks with WD-40 so the wheels or gliders more more freely.