How to remove collision effect of an object?

How do I remove the collision layer I added on an object using tile collision editor? Thanks a lot!!

This object layer can currently only be deleted in the file by using a text editor. It is a missing feature (or even a bug) covered by the following issue:

https://github.com/bjorn/tiled/issues/1230

I’ll make sure to get around to this for Tiled 1.1.