Disconnect the display option is missing.

Uncheck "use all my monitors"in RDP display settings or please window+p and select pc screen only to disconnect

Windows 11 no longer exposes a separate “Disconnect this display” option in the Multiple displays drop-down for detected monitors. Instead, displays are managed by arranging, extending, or duplicating them in Settings.

To control how RDP uses your monitors without relying on “Disconnect this display”, use one of these supported approaches:

1. Rearrange and extend only the monitors that should be active
   1. Select Start > Settings > System > Display.
   2. Under the diagram, select the monitor(s) that should participate in the desktop and choose Extend desktop to this display.
   3. Arrange the displays by dragging them so that the mouse moves smoothly between only the monitors that are needed.
   4. Leave any unwanted physical monitor either powered off or not cabled so that Windows does not detect and use it.
2. Use RDP multi-monitor settings instead of disconnecting a display For Remote Desktop sessions, control which local displays are used by the session via RDP properties rather than Windows’ “Disconnect this display” option:
   • Use the use multimon RDP property to decide whether the session uses one or multiple displays.
   • Use the display selector RDP property (a comma-separated list of display IDs) to specify exactly which local displays are used in the remote session. Display IDs can be retrieved with mstsc.exe /l. Only contiguous displays are supported.
   • If a multi-display session should fall back to a single display when leaving full screen, configure singlemoninwindowedmode:i:1. Otherwise, leave it at the default 0 so all displays remain in use.

By configuring RDP to use only the desired display(s), the remote session can be constrained to a single monitor without needing a “Disconnect this display” option in Windows display settings.

References:

• How to use multiple monitors in Windows
• Supported RDP properties