My new 540 doesn't have "search for bluetooth sensors". It's a function I need because ANT+ has some drops during my activities and doesn't happen with blue connection(same issue with forerunner945/955)
When Garmin is searching...ANT+ appears and...nothing more happens. BLE is ON, other connections are OFF. Other BLE sensors work fine(connected from FR955 sensors, moved with Garmin connect). It was a good function, I don't understand why Garmin remove "search BLE sensors"...
Are the sensors you looking for Garmin sensors, and if so are they already paired to the Edge.
If the answer to both questions is yes then it will not show you those sensors as BLE as they are already paired over ANT.
You would need to go down into the sensor details and switch the protocol from ANT and BLE.
Is there a reason you want to use BLE instead of ANT?
I have Scosche hr sensor. With ANT+ there are some breaks. Using bluetooth it works great. Sensor details works only for Garmin sensors, I know.
I have the same problem with forerunner 955. I try pairing bluetooth but this option disappears in the watch too. Bluetooth connection works only with sensor paired some months ago. Now it's impossible for me, only ANT+. I tried searching hr sensors and "search all" too.