RDP With Multi-Monitor Feature. No SPAN

Hi,

we bought some Wyse 3040 and now we want to use some devices in multi-monitor mode for RDP sessions (No SPAN since we have 2 monitors plugged in to the devices).
Unfortunately, we have not yet found the right setting to start an RDP session as a multi-monitor. Each time a connection is initialized as Span Mode. But we want the full Multi-Monitor feature, where in the RDP session both monitors are recognized as individual displays. The local Wyse desktop seems to display correctly in multi-monitor mode.
Does anyone have any experience with this and can you give me a hint?

Devices used:
Dell Wyse 3040 (Firmware: 8.6.303)

Used management:
WMS 2.0

Used configuration:

∨General Settings (8.5+)
Settings for automatic startup
Automatic start-up: No
Locale settings
Load language file: No
System language: German
Name of the locale file: — No selection available —
Name of the font file: — No selection available —
mirror file server
mirror file server: Yes
Terminal settings
Terminal name: $SN
Restart the terminal: No
Inactive: 0
No session time: 0
Audio settings (8.6+)
Configure audio settings: No
WMS Agent Settings
Activate memory: No
Mouse settings (8.6+)
Mouse speed: 4
Change mouse buttons: No
Drag to touch screen: No
Reverse the scrolling direction: No
Large cursor: No
Deactivate: No
Configure mouse settings: Yes

∨General Settings
Login settings
Domain name:
Save last username when logging out: Yes, user name and domain
Disable domain field (8.5+): No
Save last username and/or last domain on restart/shutdown: Yes
Time zone
Set the time zone manually: Yes
Time zone: GMT+01:00 – Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
Activate daylight saving time: Yes, I want to configure this
Starting month: March
Starting week of the month: 5
Start day of the month: Sunday
End month: October
End week of the month: 5
End day of the week: Sunday
Date format (8.5+): yyyy/mm/dd
Time format (8.5+): 24-hour format
Time server: pool.ntp.org

∨Security
Login settings
Make domain registration necessary: Use of NTLM
Disable guest users: Yes
Make it necessary to enter the password again: No
Smartcard required: No
Authorization settings
Authorization level: None
Allow lockout: No
Show display settings (8.5+): Yes
Enable keyboard and mouse settings (8.5+): Yes
Disable date and time (8.5+): No
Administrator mode
Activate administrator mode: Yes
Administrator user name: administrator
Administrator password: ••••••
Encrypted credentials (8.5+): Yes
Show “Administrator Mode” button (8.5+): Yes
General settings
Activate reset with the G key: No
Enable tracing: No
Remove certificate (8.5+): No
Install certificates automatically: No
Deactivate ThinPrint Service: Yes
Encrypt local flash: Yes
Disable VNC mirroring: No
Button for quick disconnection: No
Security Policy
Security Policy (8.5+): Low
Check general name for TLS (8.6+): Yes
Secured network protocol (8.5+): No
TLS minimum version (8.5+): TLS 1.2
TLS maximum version (8.5+): TLS 1.2
DNS file server discovery (8.5+): Yes
VNC settings
Activate VNC: Yes
VNC password: •••••••
Encrypt password (8.5+): Yes
Maximum number of simultaneous VNC connections (8.5+): 0
Zlib compression (8.5+): No
Prompt user at startup: No
Prompt user at the end: No
Display only: No
Force 8 bits: No
WDM service
Disable WDM service: Yes
Fast mode (8.5+): Yes

∨Display
Monitor Display Settings
Monitors: Activate two monitors
Monitor mode: Span mode
Main screen: Screen 2
Alignment: Bottom
Layout (8.5+): Landscape
Taskbar (8.5+): MainScreen
Replace screen (8.5+): No
Determine monitors automatically (8.5+): Yes
Desktop color depth: 32-bit
Primary monitor settings
Monitor resolution: DDC
Monitor rotation: None
Secondary Monitor Settings
Monitor resolution (8.5+): DDC
Monitor rotation (8.5+): None
Multi-touch (8.6+)
Multi-touch: No
Screen saver settings
Screen saver (8.5+): 0
Lock terminal (8.5+): 0
Screen saver type (8.5+):
Idle state (8.5+): 0
Use hours instead of minutes (8.6+): No

∨Visual Experience
Desktop view
Desktop color (8.6+): #285880
Desktop background image: Activate background image
background image file: ashim-d-silva-iHJOHaUD8RY-unsplash.jpg
Wallpaper layout: Stretch
Company logo: Yes
Logo file: MSymbol_S_360x100.png
EULA upon registration: No
Visual experience
Classic Desktop compared to Zero Launchpad: Classic Desktop
Action at the end of all sessions: Log off automatically
Counter for logoffs (8.6+): 2

∨Firmware upgrade
Firmware upgrade
Logic of firmware update: Any other firmware
Skip local firmware check (see warning in description): Yes
Disable Live Upgrade: Yes
5060: D10Q_wnos-8.6_303
3040: A10Q_wnos-8.6_303
Enable BIOS upgrade: Yes
BIOS file: A10Q_bios.bin-1.2.5
Verify signature: Yes
Enable Package Upgrade (8.6_017+) No

∨Advanced
Extended
No global INI: Yes

∨Global Session settings
Local resources
Assign printer: Yes
Assign serial interfaces: Yes
Assign smart cards: Yes
Assign sound: Yes
Assign hard disks: Yes
Read-only hard disks: Yes
Activate USB redirection: Redirect all USB devices
Show on Desktop (8.6+): All
Enable whitelist or disable blacklist: Do Not Activate Whitelist or Blacklist
Advanced settings
Reconnect after disconnection: 0
Multimonitor: No
Deactivate compression: Yes
Optimize for slow link speed: No
Full screen mode: Yes
Button for quick disconnection: No

∨Microsoft RDP settings
Basic settings
Activate NLA: Yes
Enable report generation: Yes
Force updated NLA: Yes
RDP8 settings
Bitmap Codec RemoteFX: Yes
Activate TS MM: Yes
Force expansion: Yes
RemoteFX graphics channel: Yes
UDP data traffic channel: Yes
Video optimized VOR: Yes
Advanced settings
USB redirection technology: RDP
Colour depth: 32 Bit
Maximum bitmap cache: 128
Aligned session width of 4 pixels: No
Automatically detect network: Yes
Activate H.264 for RDP: Yes

∨Direct RDP Connections
Basic settings
Connection name: Remote
Host name or IP address: remote.customer.de
UserName: $UN
Password: •••
Domain name: $DN
AutoStart: 1
Reconnect after disconnection: 0
Active screens: 1
Local resources
Assign printer: Yes
Assign serial interfaces: Yes
Assign smart cards: Yes
Map USB drive(s): Yes
Map local hard disks: Yes
Session settings
Audio playback: Play locally
RDP audio recording: Yes
Standard color depth for connections: 32-bit
Advanced settings
Connection display: Standard
Deactivate compression: Yes
Automatically detect network: Yes
Timer for mouse queue: 10
How the Session window works: Full screen
Terminal gateway settings
Use Terminal Server Gateway: No

Thanks for any hint.