We are working on the issues around sharing. Thank you for reporting.
We are sorry and are working on bringing it back as soon as possible. With the old implementation we had some issues with loading a lot of deals and contacts, so we had to make the change to improve performance.
We have introduced the ability to filter by user created columns. We are working on more types of custom columns.
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Not having the ability of filtering user-created columns is a deal breaker.