After migrating to new Sequoia version, the dock cannot be moved to another monitor

Can confirm. When the external display is aligned above the macbook, its not possible to move the dock there. Only if the external display is left, right or at the bottom. Seems to be a bug.

Upgraded last night and could no longer use the mouse to put the dock at the bottom of my external monitor.

I have my arrangement with my external above my MacBook Pro with no seam. Nothing changed except the upgrade.

worked with Apple support and they say “works as designed.” Apparently the dock now “falls” to the bottom of the arrangement stack and is immovable. I adjusted the arrangement to side by side and the dock went to my external display. While this is a workaround, it’s not ideal and I hope they put it back the way it was with the next version.

Hey all, I'm not sure if this helps with the specific issues y'all are having but it fixed mine. When I updated to Sequoia, I found that the dock stopped moving to my extended display (stacked displays). I'll just say that I needed that, a LOT. I also noticed the weird darkened outline on whichever screen "had priority." That was totally new to me. Some googling with very 5-year-old level vocabulary led me to my fix:

**In System Settings, under Desktop & Dock, change the "Click wallpaper to reveal desktop" option to "only in stage manager" from "always" (which must have been a default setting from the update).

Now I don't have the obnoxious darkened outline and my dock works on both screens.

Hope this helps y'all. Cheers.

After trying several different arrangements. It seems that the the only time that the dock can move to another monitor is when the laptop is not sitting directly between 2 monitors on top. I used to keep my Mac directly below the center of my 2 top monitors, and after the update, the dock failed to move to either of the top monitors. But if I now offset my Mac to sit directly under one of the monitors, then the dock will float to the top monitor opposite the one that the Mac sits directly under. The gap option also works but throws off a smooth mouse transition to the Mac below it. Also, side by side works as well, but for those of use that have arms for multiple monitors, that can be tough to rearrange. Here is the best configuration that I could find for my situation. Hopefully this will get worked out in a future update, so us users with this setup can go back to the original configuration.

Confirmed the workaround is to bump the main display up just a hair so that there is a small gap in between your macbook screen and the additional display that you have marked as "main" (The screen with the grey bar towards the top). Attached is a pic showing what I mean.

Same for me! When the external display is aligned above the macbook, its not possible to move the dock there. Only if the external display is left, right or at the bottom.

You are shouting, so allow me: USER ERROR!

You have disable "Displays have separate Spaces".

Turn it back on in System Settings->Desktop & Dock, log out and back in, and you will have the menu bar in each display... and er... separate Spaces (aka "Desktops") in each display.

No menu bar on other displays, and switching spaces on multiple displays at once are clear indications of what I wrote (having “displays having separate Spaces” turned off).

Did you have this on?

Did you turn it on? It only activates after logout and login.

I had my display set up in the Mac software the same way as you, SébastienK. To get my dock to appear on my external monitor when I move my mouse to the bottom edge of the external screen (without closing my MacBook Pro), I had to move the top bigger monitor in my Mac Display Settings to have NO overlap ABOVE the MacBook Pro monitor. So in my system settings I put my external monitor at the top right corner of the MacBook Screen in settings.

This functionally allows me to move the mouse from the MacBook Pro screen to the bigger external monitor by moving my mouse pointer all the way to the top right corner of the MacBook Pro, and the mouse cursor is just "funneled" into the big monitor.

Unfortunately, like yours, that big monitor's left bottom corner is about 6" to the left of the MacBook's top right corner. So it's a little jolting to have the mouse cursor jump 6" left and 2" up when moving to the upper monitor. In my screenshot, my ext monitor desktop is black because it's an OLED and I didn't want issues with burn-in.

With the Ultrawide monitor above the in-built monitor, move the mouse pointer onto the UW monitor and move over to the far left, then move down to the bottom until it stops. If the dock doesn't;t move to that monitor, tap the pointer a couple of times again on the bottom and it should move.

If the pointer moves down to the built-in screen you need to move it further left and try again. This is my setup to demonstrate. My top monitor is an LG UW unit.

Same issue. I found a decent workaround.

When you "arrange displays" leave a little space between the macbook on the bottom and the main monitor on top. That fixed it for me.

Yes, the fix has arrived in the version 15.1 (24B83)

To avoid confusion and since they never replied, I'll reply since I'm have the same issue and believe I know what they are talking about. Plus this might help others for a temporary solution until Apple figures out a fix. After updating to Sequoia last night, the issue started for me.

Prior to updating to Sequoia, in Sonoma or whichever prior iOS people had, we had our secondary and Third monitors positioned above the Macbook in the "arrange display" in display settings (what he's showing in that diagram). What he's pointing to isn't the seem, it's where the dock would appear if you hovered over that section with the cursor (it won't move to both, just which ever you are hovering over at the time). With the update to Sequoia, the dock no longer moves if you have the monitors arranged above the Macbook in "Arrange Display". That's the main issue.

The only solution I have found is to put the monitors side by side and then the dock will move between monitors, which works but not how my monitors are positioned. So that's where the frustration lies since it worked perfectly before but now awkward and not intuitive.

So it's definitely a bug that needs to be addressed.

update, macos 15.1 fixed 🎉

Can confirm this issue is fixed with 15.1. Apple listened!