@Brooksey Remove the old Deco model which does'nt support Connection Preference then the option will appear again in Deco App.

  @Brooksey 

See if any of the trouble shooting steps below help if not please get back to us.

What to do if the option is missing

1. Check for Updates:

   • Update the Deco App: Open your device's app store and check for any available updates for the TP-Link Deco app. 
   • Update Deco Firmware: Inside the Deco app, check for and install the latest firmware for all your Deco units. 

2. Verify Compatibility:

   • Check the official TP-Link website or support forums for your specific Deco model to see if it supports the connection preference feature. 
   • If your system includes older Deco models (e.g., M5, E4), the feature might not be available or might require removing the older units from your mesh. 

3. Restart Your Deco System:

   • Power off your Deco units, wait a few minutes, and then power them back on. This can sometimes resolve temporary glitches. 

4. Factory Reset (As a last resort):

   • If none of the above work, you can try a factory reset of your Deco units. Be aware that this will erase all your network settings, so you will need to set up your Deco system again from scratch.