Will only mirror 2 views will not extend poster in 10.10.5

I have the latest Mac Air with 2 monitors of Garland of Dell U2414H. It reflects only every monitor that is pretty useless. It will not extend the poster. The Layout tab shows also the 2 monitors of different sizes when the settings are the same for each.

The worst part is that they will reflect only when I chose to expand.

Same situation with my MBA from 2015.  I have 2 screens Dell U2414, two who supported the MST and DP 1.2

I can't get their mirror, they won't have the Garland.  I also tried to connect to my MBP 2014 with the same result. The only way I could extend the poster was to connect each monitor port thunderbolt/display on my MBP. Of course, it won't work with my MBA because there is only a single port TB.  I know the only other autour work would be to run a display on the port of TB and another a USB port with an adapter, which, in my opinion, is a terrible solution there is a USB port and not a mess on my desk.  Everything I've read, this is a limitation of Mac OS X, not a hardware problem. I run Parallels with a Windows VM on my MBA and he sees both displays fine with wreath using the port of TB on my MBA.  What gives Apple? Why intentionally block monitors third-party DP working with OS X?  Frustrating.  The other frustrating thing is that there is no work around what I see-

Tags: Mac OS & System Software

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