P: Allow Catalog to be stored on a networked drive.

You should be using a true client-server package. Lightroom isn't designed for multiple users.

Can't believe in 2019 I can't use a catalog on a nas with 2 computers...not concurrently of course. I have to use synctoy and stuff like that with an external ssd to sync the catalogs and this has created way more problems and data loss than the risk of working live on a local nas or file server.
I wonder if CaptureOne allows that, other than being much faster on 4k screens

I have over a 100,000 student portraits and there are 5 people at our company that need access to the Lightroom catalog. We are missing a seamless way to collaborate on a shared company-wide catalog that we can store on our NAS.

You absolute genius! For some reason it was set on "Lock" after I received the update. I hadn't thought of checking the lock option since my other tab was movable. 
Thank you very much!!

Sounds like you somehow turned on "Lock Workspace"

Go to Window > Workspace > Lock Workspace to uncheck it.

Sounds like you somehow turned on "Lock Workspace"

Go to Window > Workspace > Lock Workspace to uncheck it.

Sounds like you somehow turned on "Lock Workspace"

Go to Window > Workspace > Lock Workspace to uncheck it.

Getting ever more fed up with Adobe products.. So I just bought a Synology NAS and was looking forward to taking every bit of data off my laptop. Instead of focusing on learning to use Lightroom I now have to fiddle about with my Catalogues and data. Like other users have commented before me, I would like to keep catalogues and photos on my NAS. With the amount of money we are all paying , this feature should have been up and running within 6 months - and I am being generous. Hello guys, this is 2019 coming on 2020! if necessary re-write your blooming database using another engine, ideally one that works and is flexible enough to accommodate a NAS. Failing that, ask someone to get off his chair and contact Synology and QNAS and ask them to do something at their end to make it work. Or ideally , do both things at once! As it is, I am on the verge of abandoning this leaky ship.

I've been running LR with catalogs on a NAS for years without problems.  I've posted the scripts I use to manage this here: GitHub - kgorlen/lightroom: Windows bat and documentation for storing lightroom catalogs on NAS

According to SMB and SQLite specs, this is intended to work, so problems are the result of hardware failures and/or software bugs.  Since accessing a network drive involves more of both than when accessing an internal or external drive, the risk of catalog corruption is a bit greater, but that's why making backups is important.

Adobe could improve LR by (1) providing/hosting a list of compatible NAS products, and (2) allowing previews to be stored separately from catalogs so they could reside on a local drive with catalogs on a network drive.

"This is a different topic because I'm not interested in sharing the catalog on more than one computer"

Your use-case is different than most of the other requests here, but I think your post got moved to this topic because it requires the same technical ability, placing a catalog on a network drive.  Even with just one user, the underlying SQLite database technology used by LR doesn't work on many network-attached storage devices (because of bugs in the locking implementations on the NAS devices).