Dell U4919DW / MacBook pro 5k issue

You are welcome! But I am JeanLuc, not Grant :-)

These Snap Apps work well, but of course they determine the big screen as two monitors. So snapping either works on the left or the right side. If you really need an app covering the whole screen, you have to resize the window manually.

"Every well-behaved Mac Applications can use it without any additional work."

Yes. But this Spaces option modified the extended desktop function. While it is enabled, you never get windows covering more than one display - they will be cut at the border. This is nothing an app can manipulate or control on its own.

JeanLuc7 wrote:

You are welcome! But I am JeanLuc, not Grant :-)

These Snap Apps work well, but of course they determine the big screen as two monitors. So snapping either works on the left or the right side. If you really need an app covering the whole screen, you have to resize the window manually.

Haha, I actually wanted to thank Grant for his detailed and helpful answers but of course thank you too for your insight and help!

Okay, so that's the main thing (at least for me) that doesn't work as well compared to connect the Dell with only one cable and use it as one screen. I can't snap windows in the middle of the screen because that would span over the two virtual screens. In a "3 windows side by side" setup then I could snap the left and the right window in a predefined area but the middle one I'd have to resize manually. I think I got it now.

Although reports of improved features in upcoming software are encouraging, and may indicate progress in the right direction, you can not count on ANYTHING you hear about Apple software that has not yet been released.

The features may not be released as tested, or may even be withdrawn completely before release.

That is true but the question was if it is working right now and that is the case.

I know that Apple could remove beta features but at least right now there are no bugs with the new GPU driver. Hardware rendering etc. is working without crashes or artefacts.

Grant Bennet-Alder wrote:

You can open three WINDOWS and place them in any positions across the ENTIRE Extended Desktop, INCLUDING as many as you like split across the virtual "seam" between the displays. You can create three short windows the full width of the Extended Desktop, and stack all of them across the "seam". Or you can create one to the left, one across the center, and one toward the right. But NOT "split screen" -- that term means something else.

I bought the Dell and I have it connected now with a USB-C and a HDMI cable. I use the extended desktop and deactivated "desktops use different spaces" option and now have two separate virtual screens. The only thing not working properly is expanding windows across the "seam". I can't expand further than the seam. If I drag a window across the seam, it is "pushed down" on the right side of the screen. Possibly because of the menu bar there? Here is a picture:

What can I do to have the window in the middle not be influenced by the seam and have the Dell work like one full monitor?

I was hoping that adding the warning would encourage moderators to leave your report in place. Beta features are not even supposed to be discussed here. Your report could be removed under the standard terms of use.

Did you manually drag that window across the seam, or did you select "Full screen" ?

If that was dragged across, you may have to move the menubar to somewhere else, such as the built-in display if still in use. To do that, you drag the tiny Icon for the MenuBart on the Arragement pane to another display:

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Have the same issue with my Samsung CRG9 (C49RG9x) and MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports) 2.7 GHz Quad-Core Intel Core i7 Intel Iris Plus Graphics 655 1536 MB. It's really sad that the issue is not solved yet. Expected better support from Apple.

<<just not as convenient as having a single ultra wide screen>>

If you line them up properly, Extended Desktop will put the two halves directly adjacent and the two will act as one Extended Desktop, except the Menubar will only be on the one you choose. The mouse moves freely across the virtual seam, and can drag a window half way across, split on the two virtual screens, and that window will scroll as one.

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I am running 11.0 Beta (20A5364e) Big Sur - I can achieve 5120x2880 using the LG 5K monitor (connected USB-C) but when connecting to the Dell Dell U4919DW - it only achieves 3840x1080.

I've see that Big Sur now supports the higher resolution, but does anyone know why it will not on the 49 inch Dell monitor yet work on the 27 inch LG ?

Valuable Logic--

you posted for the first time on page 41 of this thread and did not include what model MacBook Pro you are connecting, or what cables and adapters you are using to connect to this Dell display.

Apologies.....

MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports)

3.3 GHz Dual-Core Intel Core i7

16 GB 2133 MHz LPDDR3

Intel Iris Graphics 550 1536 MB

Using the cable shipped with Dell Monitor - plugged into upper left USB-C port.

Jide O What adapter do you use? I have the CRG9 too along with a 2019 MBP 13 from 2019. I was planning on getting a thunderbolt dock to have a cable go to the CRG9 and a second 2560x1440 monitor above. I would use a dual 4k60Hz dock so I was wondering if you used any specific adapter before I purchase one. Thanks

You have a MacBook Pro 15 inch 2018 which has modern Radeon graphics.

People with modern Radeon graphics only need to upgrade to Catalina to get 5120x1440 to work without SwitchResX.

People with Intel graphics (Kaby Lake or Coffee Lake) need to upgrade to Big Sur.

People with older Intel graphics are out of luck.

People with old Radeon graphics (from MacBook Pro 15 inch 2015, Mac Pro 2013, etc.) have the garbled pixels problem which still exists in Big Sur.